Substance-Specific Risk Factors for Cannabis and Alcohol Use Among Young Adults Following Implementation of Nonmedical Cannabis Legalization

Social Norms for Cannabis Use After Nonmedical Legalization in Canada

INTRODUCTION

Social norms play an important role in cannabis use; however, there is little evidence on how social norms change in jurisdictions that legalize cannabis. This study examined trends in social norms before and after legalization of nonmedical cannabis in Canada in 2018.

METHODS

Data are from the International Cannabis Policy Study, a series of cross-sectional surveys conducted annually with Canadian respondents aged 16-65 years. Analyses were conducted in 2023 and included data from 58,045 respondents across 4 waves: the year immediately before legalization (2018) and 3 post-legalization waves (2019-2021). Regression models examined trends in injunctive norms (perceived approval of cannabis) and comfort in using cannabis in six different social contexts, adjusting for cannabis use frequency, medical authorization, and sociodemographic covariates.

RESULTS

Perceived social approval of cannabis use and comfort using cannabis in different social contexts was highest among males, frequent cannabis consumers, and those who reported medical authorization (p<0.05 in all cases). No changes in perceived approval were observed across years, except a temporary decrease in 2020 versus 2018 (OR=0.87, 95% CI=0.80, 0.95). Modest increases in comfort of using cannabis in 6 different social contexts were observed in 2019 (ß=0.10, p=0.001), 2020 (ß=0.10, p=0.001), and 2021 (ß=0.12, p<0.001) versus in 2018.

CONCLUSIONS

Social norms have remained relatively stable after nonmedical legalization in Canada, with only modest increases in comfort of using cannabis in different social settings. The findings may reflect widespread cannabis use in Canada prior to nonmedical legalization in 2018 as well as comprehensive restrictions on promotion and advertising.

Cross-Substance Associations With Transitions in Cannabis and Nicotine Use in a Statewide Sample of Young Adults in Washington State

OBJECTIVE

Understanding transitions in nicotine and cannabis use has implications for prevention and efforts to reduce harmful use. Focusing on cross-substance associations, we examined how use of one substance was associated with year-to-year transitions in frequency of use of the other among young adults in the context of legalized nonmedical cannabis.

METHOD

A statewide sample from Washington (N = 4,039; ages 18-25 at baseline) provided up to 3 years of annual data on past-month cannabis use and nicotine use (tobacco cigarettes and e-cigarettes/vaping). Manifest Markov models examined how use of each substance was associated with transitions in the other across categories of past-month no use, occasional use (1-19 days), and frequent use (≥20 days).

RESULTS

Occasional and frequent nicotine use (vs. no use) predicted higher probability of transitioning from no cannabis use to occasional or frequent cannabis use and from occasional use to frequent use, whereas associations with cessation and de-escalation were inconsistent in direction, small in magnitude, and not statistically significant. Cannabis use positively predicted onset of nicotine use, and associations of cannabis use with escalation from occasional to frequent nicotine use, de-escalation in use, and cessation in use were small and inconsistent in direction.

CONCLUSIONS

The findings corroborate prior research on cannabis and nicotine use as risk factors to address in prevention efforts. The findings do not provide strong support for prioritization of dual abstinence in efforts to encourage reductions in or cessation of cannabis or nicotine use among young adults.

Associations Between Trait Boredom and Frequency of Cannabis, Alcohol, and Tobacco Use in College Students

Objective

Boredom is a common emotion associated with substance use in college students - a group already at risk for substance misuse. The purpose of this study is to understand how two types of trait boredom (susceptibility and proneness) in college students are associated with frequency of cannabis, alcohol, and tobacco use.

Method

Data were collected from an online survey completed by a sample of undergraduate students (N = 414, Mage = 19.55, 84.5% female; 64.3% White) enrolled at a large public university in the northwest. Multivariate logistic regression was used to evaluate the association between trait boredom and frequency of cannabis, alcohol, and tobacco use after controlling for age, sex, and race.

Results

Boredom susceptibility was a significant predictor of annual, monthly, and weekly cannabis and alcohol use, but only annual and monthly tobacco use. Boredom proneness was only a significant predictor for monthly alcohol use.

Conclusions

Findings were generally consistent across types of substances and frequency of use for boredom susceptibility, indicating students higher in susceptibility, rather than proneness, are a subgroup to target prevention interventions to alleviate boredom and subsequent maladaptive coping mechanisms.