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Sevigny EL, Greathouse J, Medhin DN. Health, safety, and socioeconomic impacts of cannabis liberalization laws: An evidence and gap map. CAMPBELL SYSTEMATIC REVIEWS 2023; 19:e1362. [PMID: 37915420 PMCID: PMC10616541 DOI: 10.1002/cl2.1362] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/03/2023]
Abstract
Background Globally, cannabis laws and regulations are rapidly changing. Countries are increasingly permitting access to cannabis under various decriminalization, medicalization, and legalization laws. With strong economic, public health, and social justice incentives driving these domestic cannabis policy reforms, liberalization trends are bound to continue. However, despite a large and growing body of interdisciplinary research addressing the policy-relevant health, safety, and socioeconomic consequences of cannabis liberalization, there is a lack of robust primary and systematic research that comprehensively investigates the consequences of these reforms. Objectives This evidence and gap map (EGM) summarizes the empirical evidence on cannabis liberalization policies. Primary objectives were to develop a conceptual framework linking cannabis liberalization policies to relevant outcomes, descriptively summarize the empirical evidence, and identify areas of evidence concentration and gaps. Search Methods We comprehensively searched for eligible English-language empirical studies published across 23 academic databases and 11 gray literature sources through August 2020. Additions to the pool of potentially eligible studies from supplemental sources were made through November 2020. Selection Criteria The conceptual framework for this EGM draws upon a legal epidemiological perspective highlighting the causal effects of law and policy on population-level outcomes. Eligible interventions include policies that create or expand access to a legal or decriminalized supply of cannabis: comprehensive medical cannabis laws (MCLs), limited medical cannabidiol laws (CBDLs), recreational cannabis laws (RCLs), industrial hemp laws (IHLs), and decriminalization of cultivations laws (DCLs). Eligible outcomes include intermediate responses (i.e., attitudes/behaviors and markets/environments) and longer-term consequences (health, safety, and socioeconomic outcomes) of these laws. Data Collection and Analysis Both dual screening and dual data extraction were performed with third person deconfliction. Primary studies were appraised using the Maryland Scientific Methods Scale and systematic reviews were assessed using AMSTAR 2. Main Results The EGM includes 447 studies, comprising 438 primary studies and nine systematic reviews. Most research derives from the United States, with little research from other countries. By far, most cannabis liberalization research focuses on the effects of MCLs and RCLs. Studies targeting other laws-including CBDLs, IHLs, and DCLs-are relatively rare. Of the 113 distinct outcomes we documented, cannabis use was the single most frequently investigated. More than half these outcomes were addressed by three or fewer studies, highlighting substantial evidence gaps in the literature. The systematic evidence base is relatively small, comprising just seven completed reviews on cannabis use (3), opioid-related harms (3), and alcohol-related outcomes (1). Moreover, we have limited confidence in the reviews, as five were appraised as minimal quality and two as low quality. Authors’ Conclusions More primary and systematic research is needed to better understand the effects of cannabis liberalization laws on longer-term-and arguably more salient-health, safety, and socioeconomic outcomes. Since most research concerns MCLs and RCLs, there is a critical need for research on the societal impacts of industrial hemp production, medical CBD products, and decriminalized cannabis cultivation. Future research should also prioritize understanding the heterogeneous effects of these laws given differences in specific provisions and implementation across jurisdictions.
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Affiliation(s)
- Eric L. Sevigny
- Department of Criminal Justice and CriminologyGeorgia State UniversityAtlantaGeorgiaUSA
| | - Jared Greathouse
- Department of Criminal Justice and CriminologyGeorgia State UniversityAtlantaGeorgiaUSA
| | - Danye N. Medhin
- Department of Criminal Justice and CriminologyGeorgia State UniversityAtlantaGeorgiaUSA
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Korevaar E, Turner SL, Forbes AB, Karahalios A, Taljaard M, McKenzie JE. Evaluation of statistical methods used to meta-analyse results from interrupted time series studies: A simulation study. Res Synth Methods 2023; 14:882-902. [PMID: 37731166 PMCID: PMC10946504 DOI: 10.1002/jrsm.1669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 08/11/2023] [Accepted: 08/29/2023] [Indexed: 09/22/2023]
Abstract
Interrupted time series (ITS) are often meta-analysed to inform public health and policy decisions but examination of the statistical methods for ITS analysis and meta-analysis in this context is limited. We simulated meta-analyses of ITS studies with continuous outcome data, analysed the studies using segmented linear regression with two estimation methods [ordinary least squares (OLS) and restricted maximum likelihood (REML)], and meta-analysed the immediate level- and slope-change effect estimates using fixed-effect and (multiple) random-effects meta-analysis methods. Simulation design parameters included varying series length; magnitude of lag-1 autocorrelation; magnitude of level- and slope-changes; number of included studies; and, effect size heterogeneity. All meta-analysis methods yielded unbiased estimates of the interruption effects. All random effects meta-analysis methods yielded coverage close to the nominal level, irrespective of the ITS analysis method used and other design parameters. However, heterogeneity was frequently overestimated in scenarios where the ITS study standard errors were underestimated, which occurred for short series or when the ITS analysis method did not appropriately account for autocorrelation. The performance of meta-analysis methods depends on the design and analysis of the included ITS studies. Although all random effects methods performed well in terms of coverage, irrespective of the ITS analysis method, we recommend the use of effect estimates calculated from ITS methods that adjust for autocorrelation when possible. Doing so will likely to lead to more accurate estimates of the heterogeneity variance.
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Affiliation(s)
- Elizabeth Korevaar
- School of Public Health and Preventive MedicineMonash UniversityMelbourneVictoriaAustralia
| | - Simon L. Turner
- School of Public Health and Preventive MedicineMonash UniversityMelbourneVictoriaAustralia
| | - Andrew B. Forbes
- School of Public Health and Preventive MedicineMonash UniversityMelbourneVictoriaAustralia
| | - Amalia Karahalios
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global HealthUniversity of MelbourneMelbourneVictoriaAustralia
| | - Monica Taljaard
- Clinical Epidemiology ProgramOttawa Hospital Research InstituteOttawaOntarioCanada
- School of Epidemiology and Public HealthUniversity of OttawaOttawaOntarioCanada
| | - Joanne E. McKenzie
- School of Public Health and Preventive MedicineMonash UniversityMelbourneVictoriaAustralia
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Fataar F, Driezen P, Owusu-Bempah A, Hammond D. Patterns of problematic cannabis use in Canada pre- and post-legalisation: Differences by neighbourhood deprivation, individual socioeconomic factors and race/ethnicity. Drug Alcohol Rev 2023; 42:1534-1546. [PMID: 37137866 DOI: 10.1111/dar.13677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 04/13/2023] [Accepted: 04/13/2023] [Indexed: 05/05/2023]
Abstract
INTRODUCTION The legalisation of cannabis in Canada in 2018, and subsequent increase in prevalence of use, has generated interest in understanding potential changes in problematic patterns of use, including by socio-demographic factors such as race/ethnicity and neighbourhood deprivation level. METHODS This study used repeat cross-sectional data from three waves of the International Cannabis Policy Study web-based survey. Data were collected from respondents aged 16-65 prior to cannabis legalisation in 2018 (n = 8704), and post-legalisation in 2019 (n = 12,236) and 2020 (n = 12,815). Respondents' postal codes were linked to the INSPQ neighbourhood deprivation index. Multinomial regression models examined differences in problematic use by socio-demographic and socio-economic factors and over time. RESULTS No evidence of a change in the proportion of those aged 16-65 in Canada whose cannabis use would be classified as 'high risk' was noted from before cannabis legalisation (2018 = 1.5%) to 12 or 24 months after legalisation (2019 = 1.5%, 2020 = 1.6%; F = 0.17, p = 0.96). Problematic use differed by socio-demographic factors. For example, consumers from the most materially deprived neighbourhoods were more likely to experience 'moderate' vs 'low risk' compared to those living outside deprived neighbourhoods (p < 0.01 for all). Results were mixed for race/ethnicity and comparisons for high risk were limited by small sample sizes for some groups. Differences across subgroups were consistent from 2018 to 2020. DISCUSSION AND CONCLUSIONS The risk of problematic cannabis use does not appear to have increased in the 2 years following cannabis legalisation in Canada. Disparities in problematic use persisted, with some racial minority and marginalised groups experiencing higher risk.
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Affiliation(s)
- Fathima Fataar
- School of Public Health Sciences, University of Waterloo, Waterloo, Canada
| | - Pete Driezen
- School of Public Health Sciences, University of Waterloo, Waterloo, Canada
- Department of Psychology, University of Waterloo, Waterloo, Canada
| | | | - David Hammond
- School of Public Health Sciences, University of Waterloo, Waterloo, Canada
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Walker M, Carpino M, Lightfoot D, Rossi E, Tang M, Mann R, Saarela O, Cusimano MD. The effect of recreational cannabis legalization and commercialization on substance use, mental health, and injury: a systematic review. Public Health 2023; 221:87-96. [PMID: 37429043 DOI: 10.1016/j.puhe.2023.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 05/29/2023] [Accepted: 06/08/2023] [Indexed: 07/12/2023]
Abstract
OBJECTIVE To determine the effect of recreational cannabis legalization (RCL) and/or recreational cannabis commercialization (RCC) on emergency department (ED) visits, hospitalizations, and deaths due to substance use, injury, and mental health among those aged 11 years and older. METHODS A systematic review of six electronic databases up to February 1, 2023. Original, peer-reviewed articles with interrupted time series or before and after designs were included. Four independent reviewers screened articles and assessed risk of bias. Outcomes with 'critical' risk of bias were excluded. Protocol registered on PROSPERO (# CRD42021265183). RESULTS After screening and risk of bias assessment, 29 studies were included which examined ED visits or hospitalizations for cannabis use or alcohol (N = 10), opioid mortality (N = 3), motor vehicle fatalities or injury (N = 11), and intentional injury/mental health (N = 5). Rates or number of cannabis-related hospitalizations increased after RCL in Canada and the USA. Immediate increases in rates of cannabis-related ED visits were found after both RCL and RCC in Canada. Rates of traffic fatalities increased after RCL and RCC in certain jurisdictions in the USA. CONCLUSIONS RCL was associated with increased rates of cannabis-related hospitalizations. RCL and/or RCC was associated with increased rates of cannabis-related ED visits, consistently shown across sex and age groups. The effect on fatal motor vehicle incidents was mixed, with observed increases found after RCL and/or RCC. The effect of RCL or RCC on opioids, alcohol, intentional injury, and mental health is not clear. These results inform population health initiatives and international jurisdictions considering RCL implementation.
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Affiliation(s)
- M Walker
- Injury Prevention Research Office, Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
| | - M Carpino
- Injury Prevention Research Office, Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
| | - D Lightfoot
- Health Sciences Library, St. Michael's Hospital, Toronto, Ontario, Canada
| | - E Rossi
- Injury Prevention Research Office, Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
| | - M Tang
- Injury Prevention Research Office, Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada
| | - R Mann
- Institute for Mental Health Policy Research, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
| | - O Saarela
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - M D Cusimano
- Injury Prevention Research Office, Division of Neurosurgery, St. Michael's Hospital, Toronto, Ontario, Canada.
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Voy A. Collisions and cannabis: Measuring the effect of recreational marijuana legalization on traffic crashes in Washington State. TRAFFIC INJURY PREVENTION 2023; 24:527-535. [PMID: 37347154 DOI: 10.1080/15389588.2023.2220853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/23/2023] [Accepted: 05/28/2023] [Indexed: 06/23/2023]
Abstract
OBJECTIVE Washington State was among the first states in the US to legalize recreational consumption and retail sales of marijuana. Recreational use of cannabis was legalized December 6, 2012, following the passage of Initiative 502 30 days prior. Roughly 19 months later the first retail cannabis stores opened their doors for public sales ("commercialization"). I measure the impact of cannabis legalization and commercialization on traffic collisions in Washington State. METHODS With county-level vehicle crash data from the Washington State Department of Transportation collected monthly, I utilize an interrupted time-series framework with Poisson estimation to compare traffic collisions with recreational retail cannabis sales revenue from 2011 (three years pre-commercialization) through 2017 (three years post-commercialization). First, I measure the shift in collisions brought about by Washington's 2012 cannabis legalization. Then, I compare retail cannabis sales-a measure of commercialization-to traffic collisions based on severity of injury (fatal, severe injury, minor injury, non-injury, and all). RESULTS After controlling for confounding factors, evidence suggests that recreational cannabis legalization led to fewer fatal and serious injury collisions. Retail cannabis sales generally correlate with more traffic collisions, particularly for less severe (minor injury) crashes. These findings are robust to the inclusion of additional control variables pertaining to county-level cannabis usage and driving behavior while intoxicated. CONCLUSIONS Cannabis legalization led to fewer fatal, serious, and minor injury collisions. Commercialization (cannabis sales) correlated with an increase in less severe crashes. Although cannabis use generally increased in Washington State following legalization/commercialization, survey data suggest that driving behavior while under the influence of cannabis did not change significantly over the post-commercialization period. Future research should focus on measuring the dose-dependent impact of cannabis consumption on traffic collisions. This should include recognition of the importance of cannabis dosing, timing, and route of consumption. Lastly, the dangers of poly-drug driving-particularly cannabis and alcohol-are well established and should be high priority for further research.
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Affiliation(s)
- Annie Voy
- Economics, School of Business Administration, Gonzaga University, Spokane, Washington
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Farrelly KN, Wardell JD, Marsden E, Scarfe ML, Najdzionek P, Turna J, MacKillop J. The Impact of Recreational Cannabis Legalization on Cannabis Use and Associated Outcomes: A Systematic Review. Subst Abuse 2023; 17:11782218231172054. [PMID: 37187466 PMCID: PMC10176789 DOI: 10.1177/11782218231172054] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 04/07/2023] [Indexed: 05/17/2023]
Abstract
Background Recreational cannabis legalization has become more prevalent over the past decade, increasing the need to understand its impact on downstream health-related outcomes. Although prior reviews have broadly summarized research on cannabis liberalization policies (including decriminalization and medical legalization), directed efforts are needed to synthesize the more recent research that focuses on recreational cannabis legalization specifically. Thus, the current review summarizes existing studies using longitudinal designs to evaluate impacts of recreational cannabis legalization on cannabis use and related outcomes. Method A comprehensive bibliographic search strategy revealed 61 studies published from 2016 to 2022 that met criteria for inclusion. The studies were predominantly from the United States (66.2%) and primarily utilized self-report data (for cannabis use and attitudes) or administrative data (for health-related, driving, and crime outcomes). Results Five main categories of outcomes were identified through the review: cannabis and other substance use, attitudes toward cannabis, health-care utilization, driving-related outcomes, and crime-related outcomes. The extant literature revealed mixed findings, including some evidence of negative consequences of legalization (such as increased young adult use, cannabis-related healthcare visits, and impaired driving) and some evidence for minimal impacts (such as little change in adolescent cannabis use rates, substance use rates, and mixed evidence for changes in cannabis-related attitudes). Conclusions Overall, the existing literature reveals a number of negative consequences of legalization, although the findings are mixed and generally do not suggest large magnitude short-term impacts. The review highlights the need for more systematic investigation, particularly across a greater diversity of geographic regions.
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Affiliation(s)
- Kyra N Farrelly
- Department of Psychology, York
University, Toronto, ON, Canada
- Peter Boris Centre for Addictions
Research, St. Joseph’s Healthcare Hamilton, McMaster University, Hamilton, ON,
Canada
| | - Jeffrey D Wardell
- Department of Psychology, York
University, Toronto, ON, Canada
- Institute for Mental Health Policy
Research, Centre for Addiction and Mental Health, Toronto, ON, Canada
- Department of Psychiatry, University of
Toronto, Toronto, ON, Canada
| | - Emma Marsden
- Peter Boris Centre for Addictions
Research, St. Joseph’s Healthcare Hamilton, McMaster University, Hamilton, ON,
Canada
| | - Molly L Scarfe
- Peter Boris Centre for Addictions
Research, St. Joseph’s Healthcare Hamilton, McMaster University, Hamilton, ON,
Canada
| | - Peter Najdzionek
- Peter Boris Centre for Addictions
Research, St. Joseph’s Healthcare Hamilton, McMaster University, Hamilton, ON,
Canada
| | - Jasmine Turna
- Peter Boris Centre for Addictions
Research, St. Joseph’s Healthcare Hamilton, McMaster University, Hamilton, ON,
Canada
- Michael G. DeGroote Centre for
Medicinal Cannabis Research, McMaster University & St. Joseph’s Healthcare
Hamilton, Hamilton, ON, Canada
| | - James MacKillop
- Peter Boris Centre for Addictions
Research, St. Joseph’s Healthcare Hamilton, McMaster University, Hamilton, ON,
Canada
- Michael G. DeGroote Centre for
Medicinal Cannabis Research, McMaster University & St. Joseph’s Healthcare
Hamilton, Hamilton, ON, Canada
- Homewood Research Institute, Guelph,
ON, Canada
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Wennberg E, Windle SB, Filion KB, Thombs BD, Gore G, Benedetti A, Grad R, Ells C, Eisenberg MJ. Roadside screening tests for cannabis use: A systematic review. Heliyon 2023; 9:e14630. [PMID: 37064483 PMCID: PMC10102219 DOI: 10.1016/j.heliyon.2023.e14630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 12/20/2022] [Accepted: 03/13/2023] [Indexed: 04/04/2023] Open
Abstract
As more countries legalize recreational cannabis, roadside screening programs are imperative to detect and deter driving under the influence of cannabis. This systematic review evaluated roadside screening tests for cannabis use. We searched six databases (inception-March 2020) and grey literature sources for primary studies evaluating test characteristics of roadside screening tests for cannabis use compared to laboratory tests for cannabinoids in blood or oral fluid. The synthesis was focused on sensitivity and specificity of delta-9-tetrahydrocannabinol (THC) detection. 101 studies were included. Oral fluid tests were higher in specificity and lower in sensitivity compared to urine tests when evaluated against blood laboratory tests. Oral fluid tests were higher in sensitivity and similar in specificity compared to observational tests when evaluated against blood and oral fluid laboratory tests. Sensitivity was variable among oral fluid tests; two instrumented immunoassays (Draeger DrugTest 5000 [5 ng/mL THC cut-off] and Alere DDS 2 Mobile Test System) appeared to perform best, but definitive conclusions could not be drawn due to imprecise estimates. Specificities were similar. Overall, oral fluid tests showed the most promise for use in roadside screening for blood THC levels over legal limits; their continued development and testing are warranted. Urine tests are generally inadvisable, and observational tests require sensitivity improvements.
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Adhikari K, Maas A, Trujillo-Barrera A. Revisiting the effect of recreational marijuana on traffic fatalities. THE INTERNATIONAL JOURNAL OF DRUG POLICY 2023; 115:104000. [PMID: 36965303 DOI: 10.1016/j.drugpo.2023.104000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/25/2023] [Accepted: 02/27/2023] [Indexed: 03/27/2023]
Abstract
BACKGROUND This study examines the effect of retail recreational marijuana legalization on traffic fatalities using the most current data available and recent advancements in difference-in-difference estimation methods proposed by Callaway and Sant'Anna, (2021). METHOD A modified difference-in-difference (CS-DID) is used to estimate the effect of recreational marijuana legalization on traffic fatalities reported in the Fatality Analysis Reporting System (FARS). Difference-in-difference regression models are run at the state-year level, using data from 2007 through 2020, and compared to estimates using traditional two-way-fixed-effects (TWFE) models. RESULTS Consistent with past studies, results from conventional TWFE suggest traffic fatalities increase at a rate of 1.2 per billion vehicle miles traveled (BVMT) after retail of recreational marijuana begins. However, using the CS-DID model, we find slightly larger average total treatment effects (∼2.2 fatalities per BVMT). Moreover, the size of the effect changes across time, where cohorts "treated" earlier have substantially higher increases than those who more recently legalized. CONCLUSION Traffic fatalities increase by 2.2 per billion miles driven after retail legalization, which may account for as many as 1400 traffic fatalities annually. States who legalized earlier experienced larger traffic fatality increases. TWFE methods are inadequate for policy evaluation and do not capture heterogeneous effects across time.
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Affiliation(s)
- Kusum Adhikari
- Department of Agricultural Economics and Rural Sociology, University of Idaho. 875 Perimeter Drive; Moscow, Idaho 83483, United States
| | - Alexander Maas
- Department of Agricultural Economics and Rural Sociology, University of Idaho. 875 Perimeter Drive; Moscow, Idaho 83483, United States.
| | - Andres Trujillo-Barrera
- Department of Agricultural Economics and Rural Sociology, University of Idaho. 875 Perimeter Drive; Moscow, Idaho 83483, United States.
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González-Sala F, Tortosa-Pérez M, Peñaranda-Ortega M, Tortosa F. Effects of Cannabis Legalization on Road Safety: A Literature Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:4655. [PMID: 36901669 PMCID: PMC10001957 DOI: 10.3390/ijerph20054655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 02/27/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Legalizing medical and recreational cannabis and decriminalizing this substance may have unanticipated effects on traffic safety. The present study aimed to assess the impact of cannabis legalization on traffic accidents. METHODS A systematic review was carried out following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) declaration of the articles included in the Web of Science (WoS) and Scopus databases. The number of papers included in the review was 29. RESULTS The results show that in 15 papers, there is a relationship between the legalization of medical and/or recreational cannabis and the number of traffic accidents, while in 5 papers, no such relationship is observed. In addition, nine articles indicate a greater number of risk behaviors related to driving after consumption, identifying young, male, and alcohol consumption together with cannabis as the risk profile. CONCLUSIONS It can be concluded that the legalization of medical and/or recreational cannabis has negative effects on road safety when considering the number of jobs that affect the number of fatalities.
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Affiliation(s)
- Francisco González-Sala
- Departamento de Psicología Evolutiva y de la Educación, Universidad de Valencia, 46010 Valencia, Spain
| | - Macarena Tortosa-Pérez
- Departamento de Psicología, Universidad Internacional de Valencia-VIU, 46002 Valencia, Spain
| | - María Peñaranda-Ortega
- Departamento de Psicología Básica y Metodología, Universidad de Murcia, 30100 Murcia, Spain
| | - Francisco Tortosa
- Instituto de Investigación en Tráfico y Seguridad Vial-INTRAS, Universidad de Valencia, 46010 Valencia, Spain
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Marinello S, Powell LM. The impact of recreational cannabis markets on motor vehicle accident, suicide, and opioid overdose fatalities. Soc Sci Med 2023; 320:115680. [PMID: 36764087 DOI: 10.1016/j.socscimed.2023.115680] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 12/17/2022] [Accepted: 01/13/2023] [Indexed: 01/18/2023]
Abstract
In the U.S., an increasing number of states are legalizing regulated commercial markets for recreational cannabis, which allows private industry to produce, distribute, and sell marijuana to those 21 and older. The health impacts of these markets are not fully understood. Preliminary evidence suggests recreational markets may be associated with increased use among adults, which indicates there may be downstream health impacts on outcomes related to cannabis use. Three causes of death that are linked to cannabis use are motor vehicle accidents, suicide, and opioid overdose. Drawing on data from U.S. death certificates from 2009 to 2019, we conducted a difference-in-differences analysis to estimate the impact of recreational markets on fatalities from motor vehicle accidents, suicide, and opioid overdose in seven states: Colorado, Washington, Oregon, Alaska, Nevada, California, and Massachusetts. States with comprehensive medical cannabis programs with similar pre-trends in deaths were used as comparisons. For each outcome, a pooled estimate was generated with a meta-analysis using random effects models. The results revealed substantial increases in crash fatalities in Colorado, Oregon, Alaska, and California of 16%, 22%, 20%, and 14%, respectively. Based on estimates from all seven states, recreational markets were associated with a 10% increase in motor vehicle accident deaths, on average. This study found no evidence that recreational markets impacted suicides. Most states saw a relative reduction in opioid overdose death that ranged between 3 and 28%. On average, recreational markets were associated with an 11% reduction in opioid overdose fatalities.
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Affiliation(s)
- Samantha Marinello
- Division of Health Policy and Administration, School of Public Health, University of Illinois Chicago, 1603 W. Taylor Street, M/C 923, Chicago, IL, 60612-4394, USA.
| | - Lisa M Powell
- Division of Health Policy and Administration, School of Public Health, University of Illinois Chicago, 1603 W. Taylor Street, M/C 923, Chicago, IL, 60612-4394, USA
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Alcohol, drugs, and road traffic injuries in an emergency department in Mexico City. Injury 2023; 54:481-489. [PMID: 36588032 DOI: 10.1016/j.injury.2022.12.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 12/15/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022]
Abstract
There have been no studies reporting on the use of biological specimens in Mexico to analyze the prevalence of alcohol and drug use among Emergency Department (ED) patients with a road traffic injury (RTI). We report here on a sample of 304 adult patients, admitted to the ED of a public hospital in Mexico City from January to April 2022, after being involved in an RTI. Patients gave informed consent for a breath test measuring breath alcohol concentration (BAC) and a saliva screening test for six classes of drugs (amphetamines, barbiturates, benzodiazepines, cannabis, cocaine, and methamphetamine). We found that at least one in every four patients (27.6%) had traces of alcohol or drugs in their body upon arrival in the ED. The breath test found a positive BAC in 16.1% of the sample; the most common substances detected in saliva were amphetamines or methamphetamine (8.6%), followed by cocaine (7.0%) and cannabis (6.9%). Only a few variables differentiated those with positive BAC from those with negative BAC (male, arriving on a weekend day or night, and arriving by ambulance), and even fewer variables differentiated those testing positives for drugs than those testing negative (less than 13 years of education and drivers of cars, bicycles, or other vehicles). While alcohol continues to be the single most used substance, our findings indicate that stimulants are of great concern. Since those testing positives for alcohol or drugs are so similar in their demographic pattern to those testing negative, the introduction of biological testing as a routine practice in the ED is highly recommended. Routine testing makes it possible to provide the patient with the best treatment and is also the best way to assess substance use.
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Athanassiou M, Dumais A, Zouaoui I, Potvin S. The clouded debate: A systematic review of comparative longitudinal studies examining the impact of recreational cannabis legalization on key public health outcomes. Front Psychiatry 2023; 13:1060656. [PMID: 36713920 PMCID: PMC9874703 DOI: 10.3389/fpsyt.2022.1060656] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/20/2022] [Indexed: 01/27/2023] Open
Abstract
Background Ineffective cannabis regulatory frameworks such as prohibition have sparked interest in alternative solutions to reduce individual and societal harms. While it has been suggested that the recreational legalization process has yielded early successes, the relatively recent implementation of the novel policies has provided a modest time frame for a truly thorough establishment and assessment of key population-level indicators. The following systematic review focuses on identifying the downstream public health sequelae of cannabis legalization policies, including parameters such as cannabis consumption rates, hospitalization rates, vehicular accidents and fatalities, criminal activity, and suicidal behaviors, as well as other substance use trends. Methods An exhaustive search of the MEDLINE and Google Scholar databases were performed to identify high-quality (1) longitudinal studies, which (2) compared key public health outcomes between regions which had and had not implemented recreational cannabis legalization (RML) policies, (3) using distinct databases and/or time frames. Thirty-two original research articles were retained for review. Results Adult past-month cannabis consumption (26+ years) seems to have significantly increased following RML, whereas young adult (18-26 years) and adolescent (12-17 years) populations do not show a significant rise in past-month cannabis use. RML shows preliminary trends in increasing service use (such as hospitalizations, emergency department visits, or poisonings) or vehicular traffic fatalities. Preliminary evidence suggests that RML is related to potential increases in serious/violent crimes, and heterogeneous effects on suicidal behaviors. While the research does not illustrate that RML is linked to changing consumptions patterns of cigarette, stimulant, or opioid use, alcohol use may be on the rise, and opioid prescribing patterns are shown to be significantly correlated with RML. Conclusion The current data supports the notion that RML is correlated with altered cannabis consumption in adults, potentially increased criminal activity, and a decline in opioid quantities and prescriptions provided to patients. Future work should address additional knowledge gaps for vulnerable populations, such as individuals with mental health problems or persons consuming cannabis frequently/at higher THC doses. The effects of varying legalization models should also be evaluated for their potentially differing impacts on population-level outcomes.
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Affiliation(s)
- Maria Athanassiou
- Centre de recherche de l'Institut Universitaire en Santé Mentale de Montréal, Montreal, QC, Canada
- Department of Psychiatry and Addiction, Faculty of Medicine, University of Montreal, Montreal, QC, Canada
| | - Alexandre Dumais
- Centre de recherche de l'Institut Universitaire en Santé Mentale de Montréal, Montreal, QC, Canada
- Department of Psychiatry and Addiction, Faculty of Medicine, University of Montreal, Montreal, QC, Canada
- Philippe-Pinel National Institute of Legal Psychiatry, Montreal, QC, Canada
| | - Inès Zouaoui
- Centre de recherche de l'Institut Universitaire en Santé Mentale de Montréal, Montreal, QC, Canada
- Department of Psychiatry and Addiction, Faculty of Medicine, University of Montreal, Montreal, QC, Canada
| | - Stéphane Potvin
- Centre de recherche de l'Institut Universitaire en Santé Mentale de Montréal, Montreal, QC, Canada
- Department of Psychiatry and Addiction, Faculty of Medicine, University of Montreal, Montreal, QC, Canada
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13
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Boury H, Hall W, Fischer B. Developments and Changes in Primary Public Health Outcome Indicators Associated with the Legalization of Non-Medical Cannabis Use and Supply in Canada (2018): A Comprehensive Overview. Int J Ment Health Addict 2022:1-15. [PMID: 36589471 PMCID: PMC9794107 DOI: 10.1007/s11469-022-00986-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/05/2022] [Indexed: 12/28/2022] Open
Abstract
Canada legalized non-medical cannabis use and supply for adults in 2018. We examined developments and changes associated with the legalization policy reform on key indicators for public health, namely cannabis (including frequent/problematic) use prevalence, cannabis-related hospitalizations, cannabis-impaired driving, and cannabis sourcing. We identified peer-reviewed and "grey" study data that featured population-level or other quasi-representative samples and comparable outcome data for pre- and post-legalization periods, including possible trends of changes over time. Cannabis use has increased in select population groups, with use modes shifting away from smoking. Evidence on cannabis-related hospitalizations (e.g., for mental health) is mixed. The prevalence of cannabis-impaired driving appears to be generally steady but THC exposure among crash-involved drivers may have increased. Increasing proportions of users obtain cannabis products from legal sources but some-especially regular-users continue to use illicit sources. Overall, data suggest a mixed and inconclusive picture on cannabis legalization's impacts on essential public health indicators, including select extensions in trends from pre-legalization.
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Affiliation(s)
- Himani Boury
- Faculty of Health Sciences, Centre for Applied Research in Mental Health and Addiction, Simon Fraser University, Suite 2400, 515 W. Hastings Street, Vancouver, BC V6B 5K3 Canada
- School of Public Health, Queens University, Kingston, Canada
| | - Wayne Hall
- Faculty of Health and Behavioural Sciences, National Centre for Youth Substance Use Research, University of Queensland, 17 Upland Road, St Lucia, Australia
| | - Benedikt Fischer
- Faculty of Health Sciences, Centre for Applied Research in Mental Health and Addiction, Simon Fraser University, Suite 2400, 515 W. Hastings Street, Vancouver, BC V6B 5K3 Canada
- School of Population Health, University of Auckland, 85 Park Road, Auckland, New Zealand
- Department of Psychiatry, Federal University of Sao Paulo, R. Sena Madureira, São Paulo, 1500 Brazil
- Department of Psychiatry, University of Toronto, 250 College Street, Toronto, ON M5S2S1 Canada
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14
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Borges G, Orozco R. Alcohol and cannabis use in traffic-related injuries in Mexico City. Inj Prev 2022; 29:207-212. [PMID: 36600617 DOI: 10.1136/ip-2022-044782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/10/2022] [Indexed: 12/13/2022]
Abstract
BACTERKGROUND There is debate on whether cannabis affects road traffic injuries (RTIs) separately from the effects of alcohol. Our goals are to report the possible increase in risk of an RTI among alcohol and cannabis users by type of exposure (biological, self-reported and combined) and the possible interaction of alcohol and cannabis in patients with an RTI in an emergency department in Mexico City. METHODS A case-crossover study with 433 cases of RTI (as a pedestrian, driver or passenger) during the period January-April 2022. A breath sample, an oral sample for cannabis detection and self-reported alcohol and cannabis use 6 hours prior to the RTI and in two control periods were used. We report ORs and 95% CIs from conditional logistic regressions for the case-crossover estimates. RESULTS Alcohol alone increased the risk of an RTI (OR=6.02, 95% CI 3.29 to 10.99) for most RTIs, regardless of whether we used information from self-reports or a breath sample in the hazard period. Conversely, cannabis only increased the RTI when we added information in the hazard period from self-reports or oral samples. Nevertheless, this increase in risk disappeared (OR=2.06, 95% CI 0.90 to 4.70) among those who only used cannabis. We also found no evidence of interaction between alcohol and cannabis in the risk of an RTI. CONCLUSIONS Alcohol is the most commonly used substance in Mexico and a high-risk factor for RTI in Mexico City. Although cannabis alone was not associated with an RTI, continuous monitoring of its effects is required.
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Affiliation(s)
- Guilherme Borges
- Center of Global Mental Health, National Institute for Psychiatry Ramon de la Fuente Muniz, Ciudad de Mexico, Mexico
| | - Ricardo Orozco
- Center of Global Mental Health, National Institute for Psychiatry Ramon de la Fuente Muniz, Ciudad de Mexico, Mexico
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15
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Windle SB, Socha P, Nazif-Munoz JI, Harper S, Nandi A. The Impact of Cannabis Decriminalization and Legalization on Road Safety Outcomes: A Systematic Review. Am J Prev Med 2022; 63:1037-1052. [PMID: 36167602 DOI: 10.1016/j.amepre.2022.07.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 06/30/2022] [Accepted: 07/25/2022] [Indexed: 11/15/2022]
Abstract
INTRODUCTION There is substantial debate concerning the impact of cannabis decriminalization and legalization on road safety outcomes. METHODS Seven databases were systematically searched: Embase, MEDLINE, and PsycINFO through Ovid as well as Web of Science Core Collection, SafetyLit, Criminal Justice Database (ProQuest), and Transport Research International Documentation (from inception to June 16, 2021). Eligible primary studies examined group-level cannabis decriminalization or legalization and a road safety outcome in any population. RESULTS A total of 65 reports of 64 observational studies were eligible, including 39 that applied a quasi-experimental design. Studies examined recreational cannabis legalization (n=50), medical cannabis legalization (n=22), and cannabis decriminalization (n=5). All studies except 1 used data from the U.S. or Canada. Studies found mixed impacts of legalization on attitudes, beliefs, and self-reported driving under the influence. Medical legalization, recreational legalization, and decriminalization were associated with increases in positive cannabis tests among drivers. Few studies examined impacts on alcohol or other drug use, although findings suggested a decrease in positive alcohol tests among drivers associated with medical legalization. Medical legalization was associated with reductions in fatal motor-vehicle collisions, whereas recreational legalization was conversely associated with increases in fatal collisions. DISCUSSION Increased cannabis positivity may reflect changes in cannabis use; however, it does not in itself indicate increased impaired driving. Subgroups impacted by medical and recreational legalization, respectively, likely explain opposing findings for fatal collisions. More research is needed concerning cannabis decriminalization; the impacts of decriminalization and legalization on nonfatal injuries, alcohol and other drugs; and the mechanisms by which legalization impacts road safety outcomes.
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Affiliation(s)
- Sarah B Windle
- Department of Epidemiology, Biostatistics and Occupational Health, School of Population and Global Health, McGill University, Montreal, Quebec, Canada; Institute for Health and Social Policy, School of Population and Global Health, McGill University, Montreal, Quebec, Canada.
| | - Peter Socha
- Department of Epidemiology, Biostatistics and Occupational Health, School of Population and Global Health, McGill University, Montreal, Quebec, Canada
| | - José Ignacio Nazif-Munoz
- Programmes d'études et de recherche en toxicomanie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Longueuil, Quebec, Canada
| | - Sam Harper
- Department of Epidemiology, Biostatistics and Occupational Health, School of Population and Global Health, McGill University, Montreal, Quebec, Canada; Institute for Health and Social Policy, School of Population and Global Health, McGill University, Montreal, Quebec, Canada
| | - Arijit Nandi
- Department of Epidemiology, Biostatistics and Occupational Health, School of Population and Global Health, McGill University, Montreal, Quebec, Canada; Institute for Health and Social Policy, School of Population and Global Health, McGill University, Montreal, Quebec, Canada
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16
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Teeters JB, Armstrong NM, King SA, Hubbard SM. A randomized pilot trial of a mobile phone-based brief intervention with personalized feedback and interactive text messaging to reduce driving after cannabis use and riding with a cannabis impaired driver. J Subst Abuse Treat 2022; 142:108867. [PMID: 36007434 PMCID: PMC10810297 DOI: 10.1016/j.jsat.2022.108867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 07/27/2022] [Accepted: 08/13/2022] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Driving after cannabis use (DACU) and riding with a cannabis-impaired driver (RWCD) are national public health concerns. Though driving impairments and increased crash risk make DACU and RWCD two of the riskiest cannabis-related behaviors, many continue to drive after use and ride with others who are under the influence and do not view DACU or RWCD as dangerous. The current study examined the efficacy of an accessible, low-cost, mobile phone-based brief intervention aimed at reducing DACU and RWCD among college cannabis users in the context of a randomized three-group pilot trial. METHOD Participants were 97 college cannabis users (67.4 % women; average age = 21.34; 80.4 % Caucasian) who endorsed DACU at least three times in the past three months. After completing baseline measures, the study randomly assigned participants to one of three conditions: a) a substance impaired-driving personalized feedback plus MI-style interactive text messaging intervention (PF + MIT); b) a substance impaired-driving personalized feedback only intervention (PF); and c) a substance information control condition (IC). All conditions completed outcome measures three months postintervention. RESULTS Generalized linear mixed models (GLMM) analyses indicated that after controlling for sex, cannabis users in the PF + MIT condition significantly reduced DACU and RWCD over time compared to those in the IC condition. CONCLUSIONS These findings provide preliminary support for the short-term efficacy of a mobile phone-based intervention in decreasing DACU and RWCD among college cannabis users. Future research should determine whether these reductions in driving behaviors persist past three months.
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Affiliation(s)
- Jenni B Teeters
- Psychological Sciences Department, Western Kentucky University, United States of America.
| | - Nicole M Armstrong
- Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, United States of America
| | - Shelby A King
- Psychology Department, East Tennessee State University, United States of America
| | - Sterling M Hubbard
- Counseling Psychology Department, Iowa State University, United States of America
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17
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Kilmer B, Rivera-Aguirre A, Queirolo R, Ramirez J, Cerdá M. Cannabis legalization and traffic injuries: exploring the role of supply mechanisms. Addiction 2022; 117:2325-2330. [PMID: 35129240 DOI: 10.1111/add.15840] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 01/10/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND AIM In Uruguay, residents age 18 and older seeking legal cannabis must register with the government and choose one of three supply mechanisms: self-cultivation, non-profit cannabis clubs or pharmacies. This is the first paper to measure the association between type of legal cannabis supply mechanism and traffic crashes involving injuries. DESIGN Ecological study using ordinary least squares regression to examine how department-level variation in registrations (overall and by type) is associated with traffic crashes involving injuries. SETTING Uruguay. CASES 532 department-quarters. MEASUREMENTS Quarterly cannabis registration counts at the department level and incident-level traffic crash data were obtained from government agencies. The analyses controlled for department-level economic and demographic characteristics and, as a robustness check, we included traffic violations involving alcohol for departments reporting this information. Department-level data on crashes, registrations and alcohol violations were denominated by the number of residents ages 18 and older. FINDINGS From 2013 to 2019, the average number of registrations at the department-quarter level per 10 000 residents age 18 and older for self-cultivation, club membership and pharmacy purchasing were 17.7 (SD = 16.8), 3.6 (SD = 8.6), and 25.1 (SD = 50.4), respectively. In our multivariate regression analyses, we did not find a statistically significant association between the total number of registrations and traffic crashes with injuries (β = -0.007; P = 0.398; 95% CI = -0.023, 0.01). Analyses focused on the specific supply mechanisms found a consistent, positive and statistically significant association between the number of individuals registered as self-cultivators and the number of traffic crashes with injuries (β = 0.194; P = 0.008; 95% CI = 0.058, 0.329). Associations for other supply mechanisms were inconsistent across the various model specifications. CONCLUSIONS In Uruguay, the number of people allowed to self-cultivate cannabis is positively associated with traffic crashes involving injuries. Individual-level analyses are needed to assess better the factors underlying this association.
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Affiliation(s)
- Beau Kilmer
- RAND Drug Policy Research Center, Santa Monica, CA, USA
| | - Ariadne Rivera-Aguirre
- Department of Population Health, New York University Grossman School of Medicine, New York, NY, USA
| | - Rosario Queirolo
- Department of Social Sciences, Universidad Católica del Uruguay, Montevideo, CP, Uruguay
| | | | - Magdalena Cerdá
- Department of Population Health, New York University Grossman School of Medicine, New York, NY, USA
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Neiswenter SA, Tupu M, Cross C, Fudenberg J, Harding BE. Postmortem
THC
in decedents following legalization of recreational cannabis in Clark County, Nevada. J Forensic Sci 2022; 67:1632-1639. [DOI: 10.1111/1556-4029.15047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 03/08/2022] [Accepted: 04/12/2022] [Indexed: 11/30/2022]
Affiliation(s)
| | - Momilani Tupu
- School of Life Sciences University of Nevada Las Vegas Nevada USA
| | - Chad Cross
- Department of Environmental and Occupational Health School of Public Health University of Nevada Las Vegas Nevada USA
| | - John Fudenberg
- Office of the Coroner/Medical Examiner Las Vegas Nevada USA
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19
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Kan E, Beardslee J, Steinberg L, Frick PJ, Cauffman E. Impact of recreational cannabis legalization on cannabis use, other substance use, and drug-related offending among justice-system-involved youth. BEHAVIORAL SCIENCES & THE LAW 2022; 40:292-309. [PMID: 35460288 DOI: 10.1002/bsl.2573] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 01/28/2022] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
The present study assessed whether cannabis use, other types of substance use, and drug-related offending changed among 1216 justice-system-involved youth after recreational cannabis legalization. Using generalized estimating equation population-averaged models, we compared youth in California, where recreational cannabis is legalized, and Pennsylvania, where recreational use is still prohibited. Results indicated that cannabis use, cannabis selling, and driving under the influences (DUIs) increased more among Pennsylvanian than Californian youth. We found no changes in alcohol or noncannabis drug use after legalization. Cigarette use did not change significantly among Pennsylvanian youth, but Californian youth exhibited decreased cigarette use after legalization. Although not directly tested in the present analysis, it is possible that changes in state-level recreational cannabis policies throughout the U.S. may contribute to more permissive attitudes toward cannabis, which leads to higher use and use-related outcomes. Future research should continue to consider the potential impacts of legalization on other types of risky and illegal behavior.
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Affiliation(s)
- Emily Kan
- Department of Psychological Science, University of California, Irvine, California, USA
| | - Jordan Beardslee
- Department of Psychological Science, University of California, Irvine, California, USA
| | - Laurence Steinberg
- Department of Psychology, Temple University, Philadelphia, Pennsylvania, USA
| | - Paul J Frick
- Department of Psychology, Louisiana State University, Baton Rouge, Louisiana, USA
| | - Elizabeth Cauffman
- Department of Psychological Science, University of California, Irvine, California, USA
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20
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Brubacher JR, Chan H, Erdelyi S, Staples JA, Asbridge M, Mann RE. Cannabis Legalization and Detection of Tetrahydrocannabinol in Injured Drivers. N Engl J Med 2022; 386:148-156. [PMID: 35020985 DOI: 10.1056/nejmsa2109371] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND The effect of cannabis legalization in Canada (in October 2018) on the prevalence of injured drivers testing positive for tetrahydrocannabinol (THC) is unclear. METHODS We studied drivers treated after a motor vehicle collision in four British Columbia trauma centers, with data from January 2013 through March 2020. We included moderately injured drivers (those whose condition warranted blood tests as part of clinical assessment) for whom excess blood remained after clinical testing was complete. Blood was analyzed at the provincial toxicology center. The primary outcomes were a THC level greater than 0, a THC level of at least 2 ng per milliliter (Canadian legal limit), and a THC level of at least 5 ng per milliliter. The secondary outcomes were a THC level of at least 2.5 ng per milliliter plus a blood alcohol level of at least 0.05%; a blood alcohol level greater than 0; and a blood alcohol level of at least 0.08%. We calculated the prevalence of all outcomes before and after legalization. We obtained adjusted prevalence ratios using log-binomial regression to model the association between substance prevalence and legalization after adjustment for relevant covariates. RESULTS During the study period, 4339 drivers (3550 before legalization and 789 after legalization) met the inclusion criteria. Before legalization, a THC level greater than 0 was detected in 9.2% of drivers, a THC level of at least 2 ng per milliliter in 3.8%, and a THC level of at least 5 ng per milliliter in 1.1%. After legalization, the values were 17.9%, 8.6%, and 3.5%, respectively. After legalization, there was an increased prevalence of drivers with a THC level greater than 0 (adjusted prevalence ratio, 1.33; 95% confidence interval [CI], 1.05 to 1.68), a THC level of at least 2 ng per milliliter (adjusted prevalence ratio, 2.29; 95% CI, 1.52 to 3.45), and a THC level of at least 5 ng per milliliter (adjusted prevalence ratio, 2.05; 95% CI, 1.00 to 4.18). The largest increases in a THC level of at least 2 ng per milliliter were among drivers 50 years of age or older (adjusted prevalence ratio, 5.18; 95% CI, 2.49 to 10.78) and among male drivers (adjusted prevalence ratio, 2.44; 95% CI, 1.60 to 3.74). There were no significant changes in the prevalence of drivers testing positive for alcohol. CONCLUSIONS After cannabis legalization, the prevalence of moderately injured drivers with a THC level of at least 2 ng per milliliter in participating British Columbia trauma centers more than doubled. The increase was largest among older drivers and male drivers. (Funded by the Canadian Institutes of Health Research.).
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Affiliation(s)
- Jeffrey R Brubacher
- From the University of British Columbia, Vancouver (J.R.B., H.C., S.E., J.A.S.), Dalhousie University, Halifax, NS (M.A.), and the Centre for Addiction and Mental Health (R.E.M.) and the University of Toronto (R.E.M.), Toronto - all in Canada
| | - Herbert Chan
- From the University of British Columbia, Vancouver (J.R.B., H.C., S.E., J.A.S.), Dalhousie University, Halifax, NS (M.A.), and the Centre for Addiction and Mental Health (R.E.M.) and the University of Toronto (R.E.M.), Toronto - all in Canada
| | - Shannon Erdelyi
- From the University of British Columbia, Vancouver (J.R.B., H.C., S.E., J.A.S.), Dalhousie University, Halifax, NS (M.A.), and the Centre for Addiction and Mental Health (R.E.M.) and the University of Toronto (R.E.M.), Toronto - all in Canada
| | - John A Staples
- From the University of British Columbia, Vancouver (J.R.B., H.C., S.E., J.A.S.), Dalhousie University, Halifax, NS (M.A.), and the Centre for Addiction and Mental Health (R.E.M.) and the University of Toronto (R.E.M.), Toronto - all in Canada
| | - Mark Asbridge
- From the University of British Columbia, Vancouver (J.R.B., H.C., S.E., J.A.S.), Dalhousie University, Halifax, NS (M.A.), and the Centre for Addiction and Mental Health (R.E.M.) and the University of Toronto (R.E.M.), Toronto - all in Canada
| | - Robert E Mann
- From the University of British Columbia, Vancouver (J.R.B., H.C., S.E., J.A.S.), Dalhousie University, Halifax, NS (M.A.), and the Centre for Addiction and Mental Health (R.E.M.) and the University of Toronto (R.E.M.), Toronto - all in Canada
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21
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Conrad SE, Davis D, Vilcek N, Thompson JB, Guarino S, Papini S, Papini MR. Frustrative nonreward and cannabinoid receptors: Chronic (but not acute) WIN 55,212-2 treatment increased resistance to change in two reward downshift tasks. Pharmacol Biochem Behav 2022; 213:173320. [PMID: 34990705 DOI: 10.1016/j.pbb.2021.173320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 12/27/2021] [Accepted: 12/28/2021] [Indexed: 10/19/2022]
Abstract
Assessing the role of cannabinoid (CB) receptors in behavior is relevant given the trend toward the legalization of medicinal and recreational marijuana. The present research aims at bridging a gap in our understanding of CB-receptor function in animal models of frustrative nonreward. These experiments were designed to (1) determine the effects of chronic administration of the nonselective CB1-receptor agonist WIN 55,212-2 (WIN) on reward downshift in rats and (2) determine whether the effects of chronic WIN were reducible to acute effects. In Experiment 1, chronic WIN (7 daily injections, 10 mg/kg, ip) accelerated the recovery of consummatory behavior after a 32-to-4% sucrose downshift relative to vehicle controls. In addition, chronic WIN eliminated the preference for an unshifted lever when the other lever was subject to a 12-to-2 pellet downshift in free-choice trials, but only in animals with previous experience with a sucrose downshift. In Experiment 2, acute WIN (1 mg/kg, ip) reduced consummatory behavior, but did not affect recovery from a 32-to-4% sucrose downshift. The antagonist SR 141716A (3 mg/kg, ip) also failed to interfere with recovery after the sucrose downshift. In Experiment 3, acute WIN administration (1 mg/kg, ip) did not affect free-choice behavior after a pellet downshift, although it reduced lever pressing and increased magazine entries relative to vehicle controls. The effects of chronic WIN on frustrative nonreward were not reducible to acute effects of the drug. Chronic WIN treatment in rats, like chronic marijuana use in humans, seems to increase resistance to the effects of frustrative nonreward.
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Affiliation(s)
- Shannon E Conrad
- Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA
| | - Delaney Davis
- Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA
| | - Natalia Vilcek
- Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA
| | - Joanna B Thompson
- Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA
| | - Sara Guarino
- Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA
| | - Santiago Papini
- Department of Psychology, University of Texas at Austin, Austin, TX 78712, USA
| | - Mauricio R Papini
- Department of Psychology, Texas Christian University, Fort Worth, TX 76129, USA.
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22
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Tefft BC, Arnold LS. Estimating Cannabis Involvement in Fatal Crashes in Washington State Before and After the Legalization of Recreational Cannabis Consumption Using Multiple Imputation of Missing Values. Am J Epidemiol 2021; 190:2582-2591. [PMID: 34157068 DOI: 10.1093/aje/kwab184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 06/04/2021] [Accepted: 06/17/2021] [Indexed: 01/07/2023] Open
Abstract
The government of Washington state legalized recreational cannabis consumption in December 2012. We used data on all drivers involved in fatal crashes in Washington in the years 2008-2019 (n = 8,282) to estimate prevalence in fatal crashes of drivers with ∆9-tetrahydrocannabinol (THC; the main psychoactive compound in cannabis) in their blood before and after legalization. However, nearly half of the drivers were not tested for drugs; we therefore used multiple imputation to estimate THC presence and concentration among them. We used logistic regression followed by marginal standardization to estimate the adjusted prevalence of THC-positive drivers after legalization relative to what would have been predicted without legalization. In the combined observed and imputed data, the proportion of drivers positive for THC was 9.3% before and 19.1% after legalization (adjusted prevalence ratio: 2.3, 95% confidence interval: 1.3, 4.1). The proportion of drivers with high THC concentrations increased substantially (adjusted prevalence ratio: 4.7, 95% confidence interval: 1.5, 15.1). Some of the increased prevalence of THC-positive drivers might have reflected cannabis use unassociated with driving; however, the increased prevalence of drivers with high THC concentrations suggests an increase in the prevalence of driving shortly after using cannabis. Other jurisdictions should compile quantitative data on drug test results of drivers to enable surveillance and evaluation.
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Callaghan RC, Sanches M, Vander Heiden J, Asbridge M, Stockwell T, Macdonald S, Peterman BH, Kish SJ. Canada's cannabis legalization and drivers' traffic-injury presentations to emergency departments in Ontario and Alberta, 2015-2019. Drug Alcohol Depend 2021; 228:109008. [PMID: 34508959 DOI: 10.1016/j.drugalcdep.2021.109008] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 07/03/2021] [Accepted: 07/11/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND Worldwide momentum toward legalization of recreational cannabis use has raised a common concern that such policies might increase cannabis-impaired driving and consequent traffic-related harms, especially among youth. The current study evaluated this issue in Canada. METHODS Utilizing provincial emergency department (ED) records (April 1, 2015-December 31, 2019) from Alberta and Ontario, Canada, we employed Seasonal Autoregressive Integrated Moving Average (SARIMA) models to assess associations between Canada's cannabis legalization (via the Cannabis Act implemented on October 17, 2018) and weekly provincial counts of ICD-10-CA-defined traffic-injury ED presentations. For each province (Alberta/Ontario), SARIMA models were developed on two driver groups: all drivers, and youth drivers (aged 14-17 years in Alberta; 16-18 years, Ontario). RESULTS There was no evidence of significant changes associated with cannabis legalization on post-legalization weekly counts of drivers' traffic-injury ED visits in: (1) Alberta, all drivers (n = 52,752 traffic-injury presentations), an increase of 9.17 visits (95 % CI -18.85; 37.20; p = 0.52); (2) Alberta, youth drivers (n = 3265 presentations), a decrease of 0.66 visits (95 % CI -2.26; 0.94; p = 0.42); (3) Ontario, all drivers (n = 186,921 presentations), an increase of 28.93 visits (95 % CI -26.32; 84.19; p = 0.30); and (4) Ontario, youth drivers (n = 4565), an increase of 0.09 visits (95 % CI -6.25; 6.42; p = 0.98). CONCLUSIONS Implementation of the Cannabis Act was not associated with evidence of significant post-legalization changes in traffic-injury ED visits in Ontario or Alberta among all drivers or youth drivers, in particular.
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Affiliation(s)
- Russell C Callaghan
- University of Northern British Columbia, Northern Medical Program, 3333 University Way, Prince George, British Columbia, V2N 4Z9, Canada; Centre for Addiction and Mental Health (CAMH), Human Brain Laboratory, 250 College Street, Toronto, Ontario, M5T 1L8, Canada; University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada.
| | - Marcos Sanches
- Centre for Addiction and Mental Health (CAMH), Krembil Centre for Neuroinformatics, 250 College Street, Toronto, Ontario, M5T 1L8, Canada
| | - Julia Vander Heiden
- University of Northern British Columbia, Northern Medical Program, 3333 University Way, Prince George, British Columbia, V2N 4Z9, Canada; University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada; University of British Columbia, Faculty of Medicine, MD Undergraduate Program, 317-2194 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada
| | - Mark Asbridge
- Department of Community Health and Epidemiology, Department of Emergency Medicine Centre for Clinical Research, Room 407, 5790 University Ave, Halifax, Nova Scotia, B3H 1V7, Canada
| | - Tim Stockwell
- University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada
| | - Scott Macdonald
- University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada
| | - Bronwen Hughes Peterman
- University of Victoria, Canadian Institute for Substance Use Research (CISUR), 2300 McKenzie Avenue, Victoria, British Columbia, V8N 5M8, Canada
| | - Stephen J Kish
- Centre for Addiction and Mental Health (CAMH), Human Brain Laboratory, 250 College Street, Toronto, Ontario, M5T 1L8, Canada
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24
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Windle SB, Sequeira C, Filion KB, Thombs BD, Reynier P, Grad R, Ells C, Eisenberg MJ. Conduite avec facultés affaiblies après la légalisation du cannabis à usage récréatif. CMAJ 2021; 193:E1071-E1075. [PMID: 34253556 PMCID: PMC8342014 DOI: 10.1503/cmaj.191032-f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Sarah B Windle
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Crystal Sequeira
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Kristian B Filion
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Brett D Thombs
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Pauline Reynier
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Roland Grad
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Carolyn Ells
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc
| | - Mark J Eisenberg
- Institut Lady Davis (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Hôpital général juif; Département d'épidémiologie, de biostatistique et de santé du travail (Windle, Filion, Thombs, Eisenberg), Université McGill; Faculté de médecine (Filion, Thombs, Eisenberg), Université McGill; Départements de psychiatrie, de psychologie et de psychologie de l'enseignement et du counseling (Thombs), Université McGill; Département de médecine familiale (Grad, Ells), Université McGill; Unité d'éthique biomédicale, Division de médecine expérimentale et Département des sciences sociales en médecine (Ells), Université McGill; Département de cardiologie (Eisenberg), Hôpital général juif, Montréal, Qc.
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25
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Spindle TR, Martin EL, Grabenauer M, Woodward T, Milburn MA, Vandrey R. Assessment of cognitive and psychomotor impairment, subjective effects, and blood THC concentrations following acute administration of oral and vaporized cannabis. J Psychopharmacol 2021; 35:786-803. [PMID: 34049452 PMCID: PMC9361180 DOI: 10.1177/02698811211021583] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Cannabis legalization is expanding, but there are no established methods for detecting cannabis impairment. AIM Characterize the acute impairing effects of oral and vaporized cannabis using various performance tests. METHODS Participants (N = 20, 10 men/10 women) who were infrequent cannabis users ingested cannabis brownies (0, 10, and 25 mg Δ-9-tetrahydrocannabinol, THC) and inhaled vaporized cannabis (0, 5, and 20 mg THC) in six double-blind outpatient sessions. Cognitive/psychomotor impairment was assessed with a battery of computerized tasks sensitive to cannabis effects, a novel test (the DRiving Under the Influence of Drugs, DRUID®), and field sobriety tests. Blood THC concentrations and subjective drug effects were evaluated. RESULTS Low oral/vaporized doses did not impair cognitive/psychomotor performance relative to placebo but produced positive subjective effects. High oral/vaporized doses impaired cognitive/psychomotor performance and increased positive and negative subjective effects. The DRUID® was the most sensitive test to cannabis impairment, as it detected significant differences between placebo and active doses within both routes of administration. Women displayed more impairment on the DRUID® than men at the high vaporized dose only. Field sobriety tests showed little sensitivity to cannabis-induced impairment. Blood THC concentrations were far lower after cannabis ingestion versus inhalation. After inhalation, blood THC concentrations typically returned to baseline well before pharmacodynamic effects subsided. CONCLUSIONS Standard approaches for identifying impairment due to cannabis exposure (i.e. blood THC and field sobriety tests) have severe limitations. There is a need to identify novel biomarkers of cannabis exposure and/or behavioral tests like the DRUID® that can reliably and accurately detect cannabis impairment at the roadside and in the workplace.
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Affiliation(s)
- Tory R Spindle
- Behavioral Pharmacology Research Unit, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Erin L Martin
- Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC, USA
| | | | | | | | - Ryan Vandrey
- Behavioral Pharmacology Research Unit, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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26
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Fedorova EV, Ataiants J, Wong CF, Iverson E, Lankenau SE. Changes in Medical Cannabis Patient Status before and after Cannabis Legalization in California: Associations with Cannabis and Other Drug Use. J Psychoactive Drugs 2021; 54:129-139. [PMID: 34044753 DOI: 10.1080/02791072.2021.1926604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
It is unknown how patterns of cannabis and other drug use changed among young adult cannabis users as they became, exited or stayed medical cannabis patients (MCPs) after California legalized cannabis for adult use in 2016. A cohort of 18-26 year-old cannabis users was recruited in Los Angeles in 2014-15 (64.8% male; 44.1% Hispanic/Latinx). Based on wave 1 (pre-legalization) and wave 4 (post-legalization) MCP status, four transition groups emerged: MCP, Into MCP, Out of MCP and NPU (non-patient user). Relationships between self-reported medical cannabis use, transition group membership, and cannabis/other drug use outcomes were examined. Changes in cannabis practices were consistent with changes in MCP status. Cannabis days, concentrate use, self-reported medical cannabis use and driving under influence of cannabis were highest among MCP, increased for Into MCP, and decreased for Out of MCP in wave 4. A majority of drug use outcomes decreased significantly by wave 4. Self-reported medical cannabis use was associated with more frequent cannabis use but less problematic cannabis and other drug use. Future studies should continue to monitor the impact of policies that legalize cannabis for medical or recreational use, and medical motivations for cannabis use on young adults' cannabis and other drug use.
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Affiliation(s)
- Ekaterina V Fedorova
- Department of Community Health and Prevention, Drexel University Dornsife School of Public Health, Philadelphia, PA, USA
| | - Janna Ataiants
- Department of Community Health and Prevention, Drexel University Dornsife School of Public Health, Philadelphia, PA, USA
| | - Carolyn F Wong
- Department of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, CA, USA.,Division of Adolescent Medicine, Children's Hospital Los Angeles, Los Angeles, CA, USA.,Division of Research on Children, Youth, & Families, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Ellen Iverson
- Department of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, CA, USA.,Division of Adolescent Medicine, Children's Hospital Los Angeles, Los Angeles, CA, USA
| | - Stephen E Lankenau
- Department of Community Health and Prevention, Drexel University Dornsife School of Public Health, Philadelphia, PA, USA
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27
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Public health impacts to date of the legalisation of medical and recreational cannabis use in the USA. Neuropharmacology 2021; 193:108610. [PMID: 34010617 DOI: 10.1016/j.neuropharm.2021.108610] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 05/09/2021] [Accepted: 05/10/2021] [Indexed: 11/20/2022]
Abstract
The legality of cannabis use has been changing in a number of jurisdictions around the world. In the U.S., it has been legalised for medicinal and/or recreational uses in 34 jurisdictions and counting. This study leverages the decades-long experience of legalisation in the U.S. to provide an overview of the associated changes in public attitudes, cannabis markets and adverse health effects. We found a broad-based warming of public attitudes toward legalisation, potentially influenced by the increasingly positive portrayal of cannabis in media and declines in cannabis risk perceptions. Potency of cannabis products increased significantly while prices fell sharply. Although adults were less responsive to price changes than adolescents, adults who use cannabis regularly were sensitive to prices, with an estimated 10% price reduction leading to about 2.5% increase in the rate of use. Overall, past-year cannabis use has increased in adults since 2002, and adults over 26 years old who resided in states with medicinal cannabis laws were more likely to have used cannabis in the past 30 days, to have used daily, and to have higher rates of cannabis use disorders than adults who resided in states without legalised medicinal cannabis. Traffic fatalities involving cannabis temporarily increased in some states post-legalisation, and there were more presentations to medical services related to chronic regular cannabis use. There is suggestive evidence that adverse health consequences have increased among people who use cannabis regularly since legalisation. More robust research is needed to determine whether these effects of legalisation are temporary or long-term.
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28
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Windle SB, Sequeira C, Filion KB, Thombs BD, Reynier P, Grad R, Ells C, Eisenberg MJ. Impaired driving and legalization of recreational cannabis. CMAJ 2021; 193:E481-E485. [PMID: 33824147 PMCID: PMC8049641 DOI: 10.1503/cmaj.191032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Sarah B Windle
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Crystal Sequeira
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Kristian B Filion
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Brett D Thombs
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Pauline Reynier
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Roland Grad
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Carolyn Ells
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que
| | - Mark J Eisenberg
- Lady Davis Institute (Windle, Sequeira, Filion, Thombs, Reynier, Grad, Ells, Eisenberg), Jewish General Hospital; Department of Epidemiology, Biostatistics and Occupational Health (Windle, Filion, Thombs, Eisenberg), McGill University; Department of Medicine (Filion, Thombs, Eisenberg), McGill University; Departments of Psychiatry, of Psychology, and of Educational and Counselling Psychology (Thombs), McGill University; Department of Family Medicine (Grad, Ells), McGill University; Biomedical Ethics Unit, Division of Experimental Medicine, and Department of Social Sciences of Medicine (Ells), McGill University; Division of Cardiology (Eisenberg), Jewish General Hospital, Montréal, Que.
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29
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Carlini BH, Garrett SB, Firth C, Harwick R. Cannabis Retail Staff ("Budtenders") Attitudes Towards Cannabis Effects on Health and Experiences Interacting with Consumers - Washington State, USA. J Psychoactive Drugs 2021; 54:34-42. [PMID: 33781175 DOI: 10.1080/02791072.2021.1900628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Cannabis legalization in Washington State has increased the availability, consumption, and potency of cannabis products for adults. Public health education promoting safe use for adult consumers has lagged behind these trends. This study assesses the potential of cannabis retail workers (budtenders) to engage in responsible use education with adult consumers at point of sale. Focus groups explored how budtenders perceive their professional role, including educating consumers about cannabis over intoxication, storage, and risks of use before driving and during pregnancy. Transcripts were analyzed to develop a coding scheme, which was then applied with an iterative review by the research team. Budtenders identified three main professional roles: creating a good experience for customers; being compliant with the state law and regulations, and educating customers on products. Budtenders did not believe their job involved discussing use during pregnancy or while driving or safe storage. They prioritized customers' autonomy over education on these topics, and they did not necessarily consider these behaviors to be harmful. Budtenders are committed to keeping minors outside stores and educating consumers on how to avoid over intoxication and exposure to cannabis contaminants. Future research could build on this to develop point-of-sale education to reduce cannabis use risks.
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Affiliation(s)
- Beatriz H Carlini
- Addiction, Drug & Alcohol Institute, University of Washington, Seattle, WA, USA
| | - Sharon B Garrett
- Addiction, Drug & Alcohol Institute, University of Washington, Seattle, WA, USA
| | - Caislin Firth
- Addiction, Drug & Alcohol Institute, University of Washington, Seattle, WA, USA.,Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada
| | - Robin Harwick
- Addiction, Drug & Alcohol Institute, University of Washington, Seattle, WA, USA
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30
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Aydelotte JD, Mardock AL, Mancheski CA, Quamar SM, Teixeira PG, Brown CVR, Brown LH. Corrigendum to "Fatal crashes in the 5 years after recreational marijuana legalization in Colorado and Washington" [Accid. Anal. Prev. 132 (2019) 105284]. ACCIDENT; ANALYSIS AND PREVENTION 2021; 151:105757. [PMID: 33360873 DOI: 10.1016/j.aap.2020.105757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 08/28/2020] [Indexed: 06/12/2023]
Affiliation(s)
- Jayson D Aydelotte
- Division of Acute Care Surgery, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1500 Red River St., Austin, TX, 78701, USA
| | - Alexandra L Mardock
- UCLA David Geffen School of Medicine, 10833 Le Conte Ave, Los Angeles, CA, 90095, USA
| | - Christine A Mancheski
- Division of Emergency Medicine, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1400 N IH35, Suite 2.230, Austin, TX, 78701, USA
| | - Shariq M Quamar
- University of Texas, c/o Division of Emergency Medicine, 1400 N IH35, Suite 2.230, Austin, TX, 78701, USA
| | - Pedro G Teixeira
- Division of Acute Care Surgery, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1500 Red River St., Austin, TX, 78701, USA
| | - Carlos V R Brown
- Division of Acute Care Surgery, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1500 Red River St., Austin, TX, 78701, USA
| | - Lawrence H Brown
- Division of Emergency Medicine, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1400 N IH35, Suite 2.230, Austin, TX, 78701, USA.
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31
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Windle SB, Eisenberg MJ, Reynier P, Cabaussel J, Thombs BD, Grad R, Ells C, Sequeira C, Filion KB. Association between legalization of recreational cannabis and fatal motor vehicle collisions in the United States: an ecologic study. CMAJ Open 2021; 9:E233-E241. [PMID: 33731424 PMCID: PMC8096392 DOI: 10.9778/cmajo.20200155] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND With the recent legalization of recreational cannabis in Canada, cannabis-impaired driving is an important public safety concern. Our aim was to examine the association between recreational cannabis legalization and fatal motor vehicle collisions using data from the United States, which present a timely natural experiment of cannabis legalization. METHODS We conducted an ecologic study using the number of fatal motor vehicle collisions and the associated number of deaths for US jurisdictions with legalized recreational cannabis (2007-2018) retrieved from the US Fatality Analysis Reporting System. We examined jurisdiction-specific rates of fatal motor vehicle collisions and associated deaths before and after recreational cannabis legalization using Poisson regression and meta-analyzed estimates across jurisdictions using DerSimonian and Laird random-effects models. RESULTS After adjustment for calendar year, legalization was associated with increases in rates of fatal motor vehicle collisions (incidence rate ratio [IRR] 1.15, 95% confidence interval [CI] 1.06-1.26) and associated deaths (IRR 1.16, 95% CI 1.06-1.27). Differences between the first 12 months after legalization relative to subsequent months were inconclusive for rates of fatal motor vehicle collisions (IRR 0.92, 95% CI 0.84-1.02) and associated deaths (IRR 0.92, 95% CI 0.84-1.01). INTERPRETATION Recreational cannabis legalization in the US was associated with a relative increased risk of fatal motor vehicle collisions of 15% and a relative increase in associated deaths of 16%, with no conclusive difference between the first and subsequent years after legalization. These findings raise concern that there could be a similar increase in fatal motor vehicle collisions and associated deaths in Canada following recreational cannabis legalization.
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Affiliation(s)
- Sarah B Windle
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Mark J Eisenberg
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Pauline Reynier
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Josselin Cabaussel
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Brett D Thombs
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Roland Grad
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Carolyn Ells
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Crystal Sequeira
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que
| | - Kristian B Filion
- Lady Davis Institute (Windle, Eisenberg, Reynier, Cabaussel, Thombs, Grad, Ells, Sequeira, Filion) and Division of Cardiology (Eisenberg), Jewish General Hospital; Departments of Epidemiology, Biostatistics and Occupational Health (Windle, Eisenberg, Thombs, Filion), Medicine (Eisenberg, Thombs, Filion), Psychiatry (Thombs), Psychology (Thombs), Educational and Counselling Psychology (Thombs), Family Medicine (Grad, Ells) and Social Studies of Medicine (Ells), McGill University; Biomedical Ethics Unit (Ells), Division of Experimental Medicine, McGill University, Montréal, Que.
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Fink DS, Stohl M, Sarvet AL, Cerda M, Keyes KM, Hasin D. Medical marijuana laws and driving under the influence of marijuana and alcohol. Addiction 2020; 115:1944-1953. [PMID: 32141142 PMCID: PMC7483706 DOI: 10.1111/add.15031] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 10/14/2019] [Accepted: 03/03/2020] [Indexed: 11/26/2022]
Abstract
AIMS Medical marijuana law (MML) enactment in the United States has been associated with increased cannabis use but lower traffic fatality rates. We assessed the possible association of MML and individual-level driving under the influence of cannabis (DUIC) and also under the influence of alcohol (DUIA). DESIGN AND SETTING Three cross-sectional U.S. adult surveys: The National Longitudinal Alcohol Epidemiologic Survey (NLAES; 1991-1992), the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC; 2001-2002), and the NESARC-III (2012-2013). PARTICIPANTS The total n was 118 497: 41 764, 41 184, and 35 549 from NLAES, NESARC, and NESARC-III, respectively. MEASUREMENTS Across the three surveys, similar questions in the Alcohol Use Disorder and Associated Disabilities Interview Schedule assessed DUIC and DUIA. Ever-MML states enacted MML between 1991-1992 and 2012-2013 (overall period). Early-MML states enacted MML between 1991-1992 and 2001-2002 (early period). Late-MML states enacted MML between 2001-2002 and 2012-2013 (late period). MML effects on change in DUIC and DUIA prevalence were estimated using a difference-in-differences specification to compare changes in MML and other states. FINDINGS From 1991-1992 to 2012-2013, DUIC prevalence nearly doubled (from 1.02% to 1.92%), increasing more in states that enacted MML than other states (difference-in-differences [DiD] = 0.59%; 95% CI = 0.06%-1.12%). Most change in DUIC prevalence occurred between 2001-2002 and 2012-2013. DUIC prevalence increased more in states that enacted MML 2001-2002 to 2012-2013 than in never-MML states (DiD = 0.77%; 95% CI = -0.05%-1.59%), and in two early-MML states, California (DiD = 0.82; 95% CI = 0.06-1.59) and Colorado (DiD = 1.32; 95% CI = 0.11-2.53). In contrast, DUIA prevalence appeared unrelated to MML enactment. CONCLUSIONS Medical marijuana law enactment in US states appears to have been associated with increased prevalence of driving under the influence of cannabis, but not alcohol.
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Affiliation(s)
- David S. Fink
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Malki Stohl
- New York State Psychiatric Institute, New York, NY, USA
| | - Aaron L. Sarvet
- Department of Epidemiology, T.H. Chan School of Public Health, Harvard, Boston, MA, USA
| | - Magdalena Cerda
- Department of Population Health, New York University, New York, NY, USA
| | - Katherine M. Keyes
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Deborah Hasin
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA,New York State Psychiatric Institute, New York, NY, USA,Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA
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Shi Y, Liang D. The association between recreational cannabis commercialization and cannabis exposures reported to the US National Poison Data System. Addiction 2020; 115:1890-1899. [PMID: 32080937 PMCID: PMC7438241 DOI: 10.1111/add.15019] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 11/28/2019] [Accepted: 02/18/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND AIMS Recreational cannabis has been legalized in 11 states and District of Columbia (DC) in the United States. Among these, 10 states further permitted retail sale to provide a legal supply to adults. This study examined the associations of cannabis exposures with recreational cannabis legalization and commercialization. DESIGN Secondary data analysis of state-quarter level cannabis exposures during 2010-17 in the United States. Linear regressions with a difference-in-differences design were used to compare pre- and post-legalization trends in states that legalized recreational cannabis to contemporaneous trends in states that did not legalize recreational cannabis. SETTING United States, including all 50 states and DC. CASES Cannabis exposures reported to the US National Poison Data System. MEASUREMENTS The primary outcome was state age-adjusted cannabis exposures reported to the US National Poison Data System per 1 000 000 population per quarter. The two policy variables of interest included (1) the enactment of recreational cannabis legalization (i.e. removing penalties for adults' possession of cannabis in a small amount for recreational use) and (2) the initiation of recreational cannabis commercialization (i.e. providing a legal supply of cannabis to adults through licensed dispensaries). FINDINGS The association between a state's enactment of recreational cannabis legalization and its changes in cannabis exposures was statistically non-significant overall. After controlling for recreational cannabis legalization, however, the initiation of recreational cannabis commercialization was associated with 5.06-5.80 more exposures per 1 000 000 population per quarter (67-77% increase relative to the pre-legalization average), depending on the composition of comparison states. The increase associated with commercialization was higher among minors than adults (7.97-9.53 versus 3.83-4.21 more exposures), higher among males than females (6.16-7.56 versus 3.76-3.91 more exposures) and higher among exposures with medical consequences than those without medical consequences (4.09-4.79 versus 0.97-1.01 more exposures). CONCLUSION An increase in cannabis exposures reported to the US National Poison Data System was observed following recreational cannabis commercialization in the United States.
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Affiliation(s)
- Yuyan Shi
- Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, USA,Corresponding author: Yuyan Shi, PhD, 9500 Gilman Drive, La Jolla, CA 92093-0628, USA, Phone number: 1(858)534-4273,
| | - Di Liang
- Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, USA,School of Public Health, Fudan University, Shanghai, China
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Nazif-Munoz JI, Oulhote Y, Ouimet MC. The association between legalization of cannabis use and traffic deaths in Uruguay. Addiction 2020; 115:1697-1706. [PMID: 32003494 DOI: 10.1111/add.14994] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 07/01/2019] [Accepted: 01/27/2020] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND AIMS While cannabis use has been found to impair motor vehicle driving, the association between cannabis legalization and motor vehicle fatalities is unclear. In Uruguay in December 2013, cannabis for recreational purposes was legalized. This study assessed the association between implementation of this law and changes in traffic fatality rates. DESIGN Interrupted time-series analysis of traffic fatality rates of light motor vehicle drivers and motorcyclists in urban and rural settings. Changes are reported as step and trend effects against modeled trends in the absence of legalization. SETTING Uruguay, Montevideo and four rural provinces (Colonia, Florida, Río Negro and San José) from 1 January 2012 to 31 December 2017. Cases and measurement Weekly traffic fatalities of light motor vehicle drivers and motorcyclists per type of vehicle. Data were gathered from the National Road Safety Agency of Uruguay and the Ministry of Transport and Public Works, respectively. RESULTS Cannabis legalization was associated with a 52.4% immediate increase [95% confidence interval (CI) = 11.6, 93.3, P = 0.012] in the light motor vehicle driver's fatality rate. However, no significant change in the motorcyclists' fatality rate was observed. In Montevideo the legislation was associated with an absolute increase in its light motor vehicle driver's fatality rate by 0.06 (95% CI = 0.01, 0.11, P = 0.025), but no significant associations were observed in rural settings. CONCLUSIONS In Uruguay, the 2013 legislation legalizing recreational cannabis consumption may have been associated with an increase in fatal motor vehicle crashes, particularly in light motor-vehicle drivers and urban settings.
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Affiliation(s)
- Jose Ignacio Nazif-Munoz
- Faculty of Medicine and Health Sciences, Université de Sherbrooke, Quebec, Canada.,T. H. Chan School of Public Health, Harvard University, Cambridge, MA, USA
| | - Youssef Oulhote
- School of Public Health, University of Massachusetts, Amherst, MA, USA
| | - Marie Claude Ouimet
- Faculty of Medicine and Health Sciences, Université de Sherbrooke, Quebec, Canada
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Calvert C, Erickson D. An examination of relationships between cannabis legalization and fatal motor vehicle and pedestrian-involved crashes. TRAFFIC INJURY PREVENTION 2020; 21:521-526. [PMID: 32856949 PMCID: PMC7709737 DOI: 10.1080/15389588.2020.1810246] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 08/06/2020] [Accepted: 08/08/2020] [Indexed: 06/11/2023]
Abstract
OBJECTIVE While attention has been given to how legalization of recreational cannabis affects traffic crash rates, there was been limited research on how cannabis affects pedestrians involved in traffic crashes. This study examined the association between cannabis legalization (medical, recreational use, and recreational sales) and fatal motor vehicle crash rates (both pedestrian-involved and total fatal crashes). METHODS We used crash data from the Fatality Analysis Reporting System (FARS) to calculate monthly rates of fatal motor vehicle crashes and fatal pedestrian-involved crashes per 100,000 people from 1991 to 2018. Changes in monthly crash rates in three states that had legalized cannabis (Colorado, Washington, and Oregon) were compared to matched control states using segmented regression with autoregressive terms. RESULTS We found no significant differences in pedestrian-involved fatal motor vehicle crashes between legalized cannabis states and control states following medical or recreational cannabis legalization. Washington and Oregon saw immediate decreases in all fatal crashes (-4.15 and -6.60) following medical cannabis legalization. Colorado showed an increase in trend for all fatal crashes after recreational cannabis legalization and the beginning of sales (0.15 and 0.18 monthly fatal crashes per 100,000 people). CONCLUSIONS Overall findings do not suggest an elevated risk of total or pedestrian-involved fatal motor vehicle crashes associated with cannabis legalization.
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Affiliation(s)
- Collin Calvert
- University of Minnesota, School of Public Health, Division of Epidemiology and Community Health, 1300 S. 2nd Street, Suite 300, Minneapolis, MN 55454-1015
| | - Darin Erickson
- University of Minnesota, School of Public Health, Division of Epidemiology and Community Health, 1300 S. 2nd Street, Suite 300, Minneapolis, MN 55454-1015
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Santaella-Tenorio J, Wheeler-Martin K, DiMaggio CJ, Castillo-Carniglia A, Keyes KM, Hasin D, Cerdá M. Association of Recreational Cannabis Laws in Colorado and Washington State With Changes in Traffic Fatalities, 2005-2017. JAMA Intern Med 2020; 180:1061-1068. [PMID: 32568378 PMCID: PMC7309574 DOI: 10.1001/jamainternmed.2020.1757] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
IMPORTANCE An important consequence of cannabis legalization is the potential increase in the number of cannabis-impaired drivers on roads, which may result in higher rates of traffic-related injuries and fatalities. To date, limited information about the effects of recreational cannabis laws (RCLs) on traffic fatalities is available. OBJECTIVE To estimate the extent to which the implementation of RCLs is associated with traffic fatalities in Colorado and Washington State. DESIGN, SETTING, AND PARTICIPANTS This ecological study used a synthetic control approach to examine the association between RCLs and changes in traffic fatalities in Colorado and Washington State in the post-RCL period (2014-2017). Traffic fatalities data were obtained from the Fatality Analysis Reporting System from January 1, 2005, to December 31, 2017. Data from Colorado and Washington State were compared with synthetic controls. Data were analyzed from January 1, 2005, to December 31, 2017. MAIN OUTCOME(S) AND MEASURES The primary outcome was the rate of traffic fatalities. Sensitivity analyses were performed (1) excluding neighboring states, (2) excluding states without medical cannabis laws (MCLs), and (3) using the enactment date of RCLs to define pre-RCL and post-RCL periods instead of the effective date. RESULTS Implementation of RCLs was associated with increases in traffic fatalities in Colorado but not in Washington State. The difference between Colorado and its synthetic control in the post-RCL period was 1.46 deaths per 1 billion vehicle miles traveled (VMT) per year (an estimated equivalent of 75 excess fatalities per year; probability = 0.047). The difference between Washington State and its synthetic control was 0.08 deaths per 1 billion VMT per year (probability = 0.674). Results were robust in most sensitivity analyses. The difference between Colorado and synthetic Colorado was 1.84 fatalities per 1 billion VMT per year (94 excess deaths per year; probability = 0.055) after excluding neighboring states and 2.16 fatalities per 1 billion VMT per year (111 excess deaths per year; probability = 0.063) after excluding states without MCLs. The effect was smaller when using the enactment date (24 excess deaths per year; probability = 0.116). CONCLUSIONS AND RELEVANCE This study found evidence of an increase in traffic fatalities after the implementation of RCLs in Colorado but not in Washington State. Differences in how RCLs were implemented (eg, density of recreational cannabis stores), out-of-state cannabis tourism, and local factors may explain the different results. These findings highlight the importance of RCLs as a factor that may increase traffic fatalities and call for the identification of policies and enforcement strategies that can help prevent unintended consequences of cannabis legalization.
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Affiliation(s)
- Julian Santaella-Tenorio
- Center for Opioid Epidemiology and Policy,Division of Epidemiology, Department of Population Health, New York University School of Medicine, New York, New York.,School of Basic Sciences, Universidad del Valle, Cali, Colombia
| | - Katherine Wheeler-Martin
- Center for Opioid Epidemiology and Policy,Division of Epidemiology, Department of Population Health, New York University School of Medicine, New York, New York
| | - Charles J DiMaggio
- Center for Opioid Epidemiology and Policy,Division of Epidemiology, Department of Population Health, New York University School of Medicine, New York, New York.,Department of Surgery, New York University School of Medicine, New York, New York
| | - Alvaro Castillo-Carniglia
- Center for Opioid Epidemiology and Policy,Division of Epidemiology, Department of Population Health, New York University School of Medicine, New York, New York.,Society and Health Research Center and School of Public Health, Universidad Mayor, Santiago, Chile
| | - Katherine M Keyes
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, New York
| | - Deborah Hasin
- Division of Translational Epidemiology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York.,Division of Translational Epidemiology, New York State Psychiatric Institute, New York, New York
| | - Magdalena Cerdá
- Center for Opioid Epidemiology and Policy,Division of Epidemiology, Department of Population Health, New York University School of Medicine, New York, New York
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Kamer RS, Warshafsky S, Kamer GC. Change in Traffic Fatality Rates in the First 4 States to Legalize Recreational Marijuana. JAMA Intern Med 2020; 180:1119-1120. [PMID: 32568359 PMCID: PMC7309573 DOI: 10.1001/jamainternmed.2020.1769] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
This cross-sectional study examines the association of commercial sales and legalization of recreational marijuana with traffic fatalities.
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Affiliation(s)
- Russell S Kamer
- Department of Medicine, New York Medical College, Valhalla, New York
| | | | - Gordon C Kamer
- Harvard College, Harvard University, Cambridge, Massachusetts
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Fischer B, Daldegan‐Bueno D, Boden JM. Facing the option for the legalisation of cannabis use and supply in New Zealand: An overview of relevant evidence, concepts and considerations. Drug Alcohol Rev 2020; 39:555-567. [PMID: 32436274 PMCID: PMC7383663 DOI: 10.1111/dar.13087] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 04/13/2020] [Accepted: 04/13/2020] [Indexed: 12/18/2022]
Abstract
ISSUES Non-medical cannabis policies are changing, including towards legalisation-with-regulation frameworks. New Zealand will hold a public referendum on cannabis legalisation in 2020. We reviewed data on cannabis use and health/social harms; policy reform options; experiences with and outcomes of reforms elsewhere; and other relevant considerations towards informing policy choices in the upcoming referendum. APPROACH Relevant epidemiological, health, social, criminal justice and policy studies and data were identified and comprehensively reviewed. KEY FINDINGS Cannabis use is common (including in New Zealand) and associated with risks for health and social harms, mainly concentrated in young users; key harms are attributable to criminalisation. 'Decriminalisation' reforms have produced ambivalent results. Existing cannabis legalisation frameworks vary considerably in main parameters. Legalisation offers some distinct advantages, for example regulated use, products and user education, yet outcomes depend on essential regulation parameters, including commercialisation, and policy ecologies. While major changes in use are not observed, legalisation experiences are inconclusive to date, including mixed health and social outcomes, with select harms increasing and resilient illegal markets. It is unclear whether legalisation reduces cannabis exposure or social harms (e.g. from enforcement) for youth. IMPLICATIONS/CONCLUSIONS No conclusive overall evidence on the outcomes of legalisation elsewhere exists, nor is evidence easily transferable to other settings. Legalisation offers direct social justice benefits for adults, yet overall public health impacts are uncertain. Legalisation may not categorically improve health or social outcomes for youth. Legalisation remains a well-intended, while experimental policy option towards more measured and sensible cannabis control and overall greater policy coherence, requiring close monitoring and possible adjustments depending on setting-specific outcomes.
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Affiliation(s)
- Benedikt Fischer
- Schools of Population Health and Pharmacy, Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand
- Department of PsychiatryUniversity of TorontoTorontoCanada
- Centre for Applied Research in Mental Health and AddictionSimon Fraser UniversityVancouverCanada
- Department of PsychiatryFederal University of Sao PauloSao Paulo, Brazil
| | - Dimitri Daldegan‐Bueno
- Schools of Population Health and Pharmacy, Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand
| | - Joseph M. Boden
- Department of Psychological MedicineUniversity of OtagoChristchurchNew Zealand
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Hall W, Lynskey M. Assessing the public health impacts of legalizing recreational cannabis use: the US experience. World Psychiatry 2020; 19:179-186. [PMID: 32394566 PMCID: PMC7215066 DOI: 10.1002/wps.20735] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The sale of cannabis for adult recreational use has been made legal in nine US states since 2012, and nationally in Uruguay in 2013 and Canada in 2018. We review US research on the effects of legalization on cannabis use among adults and adolescents and on cannabis-related harms; the impact of legalizing adult recreational use on cannabis price, availability, potency and use; and regulatory policies that may increase or limit adverse effects of legalization. The legalization of recreational cannabis use in the US has substantially reduced the price of cannabis, increased its potency, and made cannabis more available to adult users. It appears to have increased the frequency of cannabis use among adults, but not so far among youth. It has also increased emergency department attendances and hospitalizations for some cannabis-related harms. The relatively modest effects on cannabis use to date probably reflect restrictions on the number and locations of retail cannabis outlets and the constraints on commercialization under a continued federal prohibition of cannabis. Future evaluations of legalization should monitor: cannabis sales volumes, prices and content of tetrahydrocannabinol; prevalence and frequency of cannabis use among adolescents and adults in household and high school surveys; car crash fatalities and injuries involving drivers who are cannabis-impaired; emergency department presentations related to cannabis; the demand for treatment of cannabis use disorders; and the prevalence of regular cannabis use among vulnerable young people in mental health services, schools and the criminal justice system. Governments that propose to legalize and regulate cannabis use need to fund research to monitor the impacts of these policy changes on public health, and take advantage of this research to develop ways of regulating can-nabis use that minimize adverse effects on public health.
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Affiliation(s)
- Wayne Hall
- University of Queensland Centre for Youth Substance Abuse Research, Brisbane, Australia
- National Addiction Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Michael Lynskey
- National Addiction Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
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40
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Hall W, Lane T. Road Safety Risks of Cannabis Use: Sales Need to Fund Research. Am J Public Health 2020; 110:265-266. [PMID: 32023111 DOI: 10.2105/ajph.2019.305529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Wayne Hall
- Wayne Hall is with the University of Queensland Centre for Youth Substance Abuse Research, St Lucia, Queensland, Australia. Tyler Lane is with the Insurance Work and Health Group, School of Public Health and Preventive Medicine, Monash University, Clayton, Victoria, Australia
| | - Tyler Lane
- Wayne Hall is with the University of Queensland Centre for Youth Substance Abuse Research, St Lucia, Queensland, Australia. Tyler Lane is with the Insurance Work and Health Group, School of Public Health and Preventive Medicine, Monash University, Clayton, Victoria, Australia
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What Have Been the Public Health Impacts of Cannabis Legalisation in the USA? A Review of Evidence on Adverse and Beneficial Effects. CURRENT ADDICTION REPORTS 2019. [DOI: 10.1007/s40429-019-00291-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Aydelotte JD, Mardock AL, Mancheski CA, Quamar SM, Teixeira PG, Brown CVR, Brown LH. Fatal crashes in the 5 years after recreational marijuana legalization in Colorado and Washington. ACCIDENT; ANALYSIS AND PREVENTION 2019; 132:105284. [PMID: 31518764 DOI: 10.1016/j.aap.2019.105284] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/15/2019] [Accepted: 08/26/2019] [Indexed: 06/10/2023]
Abstract
Colorado and Washington legalized recreational marijuana in 2012, but the effects of legalization on motor vehicle crashes remains unknown. Using Fatality Analysis Reporting System data, we performed difference-in-differences (DD) analyses comparing changes in fatal crash rates in Washington, Colorado and nine control states with stable anti-marijuana laws or medical marijuana laws over the five years before and after recreational marijuana legalization. In separate analyses, we evaluated fatal crash rates before and after commercial marijuana dispensaries began operating in 2014. In the five years after legalization, fatal crash rates increased more in Colorado and Washington than would be expected had they continued to parallel crash rates in the control states (+1.2 crashes/billion vehicle miles traveled, CI: -0.6 to 2.1, p = 0.087), but not significantly so. The effect was more pronounced and statistically significant after the opening of commercial dispensaries (+1.8 crashes/billion vehicle miles traveled, CI: +0.4 to +3.7, p = 0.020). These data provide evidence of the need for policy strategies to mitigate increasing crash risks as more states legalize recreational marijuana.
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Affiliation(s)
- Jayson D Aydelotte
- Division of Acute Care Surgery, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1500 Red River St., Austin, TX 78701, USA
| | - Alexandra L Mardock
- UCLA David Geffen School of Medicine, 10833 Le Conte Ave, Los Angeles, CA 90095, USA
| | - Christine A Mancheski
- Division of Emergency Medicine, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1400 N IH35, Suite 2.230, Austin, TX 78701, USA
| | - Shariq M Quamar
- University of Texas, c/o Division of Emergency Medicine, 1400 N IH35, Suite 2.230, Austin, TX 78701, USA
| | - Pedro G Teixeira
- Division of Acute Care Surgery, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1500 Red River St., Austin, TX 78701, USA
| | - Carlos V R Brown
- Division of Acute Care Surgery, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1500 Red River St., Austin, TX 78701, USA
| | - Lawrence H Brown
- Division of Emergency Medicine, Department of Surgery and Perioperative Care, Dell Medical School at the University of Texas Austin, 1400 N IH35, Suite 2.230, Austin, TX 78701, USA.
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Affiliation(s)
- Marco Leyton
- From the Departments of Psychiatry and Psychology, McGill University; the Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University; the Center for Studies in Behavioral Neurobiology, Concordia University; and the Research Unit on Children’s Psychosocial Maladjustment, Université de Montréal, Montreal, Que., Canada
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Hawken A. Commentary on Lane & Hall (2019): Trafficking and highway-safety challenges in US states that have legalized recreational cannabis sales and their neighbors. Addiction 2019; 114:857-858. [PMID: 31785064 DOI: 10.1111/add.14591] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 02/12/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Angela Hawken
- Marron Institute of Urban Management, New York University, New York, NY, USA
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