The price of tobacco and its effects on smoking behaviors in Korea: The 2015 Korea Community Health Survey

Intensity Matters: Heterogeneous impact of cigarette tax reform on drinking behaviors by smoking intensity

This paper investigates the relationship between smoking and drinking behaviors across different smoking intensity groups, using a unique policy shock that increased cigarette taxes in South Korea. Using the Korean Health Panel, we employ a difference-in-differences approach to estimate the causal effect of the cigarette price increase on alcohol consumption among heavy, average, and light smokers. We find that an increase in cigarette prices reduces drinking behavior only among heavy smokers, while cigarette consumption is reduced across all smokers. Subgroup analysis shows that the reduction in alcohol use among heavy smokers is more pronounced in the elderly, low-income, and moderately educated groups. These findings suggest that the public health benefits of cigarette taxes extend beyond their impact on smoking, particularly for those who are more vulnerable to the adverse health consequences of tobacco and alcohol.

Longitudinal assessment of smoking-related knowledge, attitude, and practice for cancer prevention: an analysis of data from the Korean National Cancer Prevention Awareness and Practice Survey

BACKGROUND

This study examined the influence of knowledge and attitudes on smoking cessation behaviors among Koreans-including both individuals who have quit smoking and those who continue to smoke-using an extended KAP (knowledge, attitude, and practice) model.

METHODS

Data for this study were drawn from the Korean National Cancer Prevention Awareness and Practice Survey conducted between 2014 and 2023, encompassing 12,400 participants. After excluding responses lacking data on KAP questions and individuals who had never smoked, the final analytic sample comprised 4,794 participants. To evaluate the associations among knowledge (that smoking causes cancer), attitudes (regarding smoking cessation for cancer prevention), and practice (the decision to stop smoking), we employed multiple logistic regression and mediation analyses to assess both the direct and indirect effects of these variables on smoking behavior.

RESULTS

Most participants demonstrated awareness that smoking causes cancer. In assessing the associations among knowledge, attitude, and practice, a decline in odds ratios was observed in 2023 compared with 2021. Attitudes toward smoking cessation for cancer prevention exerted a direct influence on the decision to quit smoking, with effect sizes of 0.23 in 2014, - 0.10 in 2016, 0.50 in 2018, 0.42 in 2021, and 0.40 in 2023. Furthermore, knowledge about smoking indirectly influenced the decision to quit smoking via its effect on attitudes toward cessation, with indirect effects of 0.12 in 2018, 0.10 in 2021, and 0.09 in 2023. Notably, knowledge did not directly affect practice; thus, attitudes toward smoking cessation emerged as the primary mediator between knowledge and the decision to quit smoking.

CONCLUSIONS

Our findings indicate that the decision to quit smoking is significantly influenced by individuals' attitudes toward smoking. Consequently, smoking cessation policies and interventions should integrate strategies that address attitudes in tandem with knowledge and practice components among Koreans. Moreover, the gradual weakening of the relationships among knowledge, attitudes, and practices over time underscores the need to reinforce these associations through innovative smoking cessation policies.

Trends in the Prevalence of Korean Adolescent Smokers According to Smoking Cessation Policy and COVID-19

This study evaluated the influence of smoking cessation policies and COVID-19 on the prevalence of smoking among Korean adolescents from 2011 to 2020. Based on the Korea Youth Risk Behavior Web-based Survey, trends in adolescent smoking behaviors were examined, including the impact of cigarette price increases, Pictorial Warning Labels (PWLs), and the onset of COVID-19. We used joinpoint regression analysis to discern annual changes in the prevalence of adolescent smokers. Results indicate that the implementation of increased cigarette prices and pictorial warnings was associated with a significant decrease in smoking prevalence among adolescents. We found a yearly reduction in smoking prevalence by 10.5% for cigarette-only smokers, 10.3% for e-cigarette-only smokers, and 9.2% for those who used both. The onset of COVID-19 further accelerated the decline in adolescent smoking. The findings suggest that the Korean government's smoking cessation strategies and pandemic-related changes have effectively reduced smoking rates among adolescents.

The effect of tobacco tax increase on price-minimizing tobacco purchasing behaviours: A systematic review and meta-analysis

BACKGROUND AND AIMS

Tobacco product excise taxes are a cost-effective method for reducing tobacco consumption, but industry pricing and marketing strategies encourage consumers to engage in price-minimizing behaviours (PMBs). We investigated the relationship between tobacco tax increases and PMBs, measuring whether PMBs intensify following tax increases, whether low-income consumers with higher nicotine dependence are more likely to engage in PMBs and whether PMBs are negatively related to smoking cessation.

METHOD

This was a systematic review with meta-analysis of cross-sectional and longitudinal studies from seven databases up to March 2023, using studies that reported any product- and purchasing-related smoking behaviours post-tobacco tax increase in a general representative population. Sixty-eight studies were quality-assessed using the Newcastle-Ottawa scale. All studies were narratively synthesized, with five studies involving 13 068-26 575 participants providing data for pooled analyses on PMBs [purchasing lower-priced brands, roll-your-own (RYO) tobacco and cartons] pre- and post-tax increases using a random effects meta-analytical model.

RESULTS

Fifty-seven studies reported on legal PMBs, and 17 studies reported illicit cigarette purchasing. Meta-analysis showed that consecutive tax increases were positively associated with purchasing RYO [odds ratio (OR) = 1.60, 95% confidence interval (CI) = 1.04-2.46], especially in higher tobacco taxing environments, with substantial heterogeneity (I2 = 96%). Lower income and higher nicotine dependence were associated with purchasing lower-priced brands and RYO, whereas higher income and nicotine dependence were associated with purchasing cartons, large-sized packs and cross-border sales. Less evidence associated illicit tobacco purchases with tax increases or PMBs with smoking cessation.

CONCLUSIONS

Tobacco purchasers' PMBs vary widely by state, country and time-period within countries. Both legal and illegal PMBs, potentially influenced by industry pricing tactics, may exacerbate health inequalities and dilute the public health benefits of tobacco tax increases.

Suicide mortality following the implementation of tobacco packaging and pricing policies in Korea: an interrupted time-series analysis

BACKGROUND

To prevent tobacco use in Korea, the national quitline number was added to tobacco packages in December 2012, tobacco prices were raised by 80% in January 2015, and graphic health warning labels were placed on tobacco packages in December 2016. This study evaluated the association of these tobacco packaging and pricing policies with suicide mortality in Korea.

METHODS

Monthly mortality from suicide was obtained from Cause-of-Death Statistics in Korea from December 2007 to December 2019. Interrupted time-series analysis was performed using segmented Poisson regression models. Relative risks (RRs) and 95% confidence intervals (CIs) were calculated adjusted for suicide prevention strategies.

RESULTS

Suicide mortality was 20 per 1,000,000 in December 2007 and showed a downward trend over the study period. After the implementation of tobacco packaging and pricing policies, suicide mortality immediately declined by - 0.09 percent points (95% CI =  - 0.19 to 0.01; P > 0.05) for the national quitline number, - 0.22 percent points (95% CI =  - 0.35 to - 0.09; P < 0.01) for tobacco prices, and - 0.30 percent points (95% CI =  - 0.49 to - 0.11; P < 0.01) for graphic health warning labels. The corresponding RRs for these post-implementation changes compared with the pre-implementation level were 0.91 (95% CI = 0.83 to 1.00), 0.80 (95% CI = 0.70 to 0.91), and 0.74 (95% CI = 0.61 to 0.90), respectively. Significant associations between tobacco control policies and suicide mortality were observed even when stratified by sex and region.

CONCLUSIONS

The findings of this study provide new evidence for an association between tobacco control policies and deaths by suicide. An array of effective tobacco control policies should be considered for prevention programs targeting suicide.

Strategies to Improve Smoking Cessation for Participants in Lung Cancer Screening Program: Analysis of Factors Associated with Smoking Cessation in Korean Lung Cancer Screening Project (K-LUCAS)

PURPOSE

Smoking cessation intervention is one of the key components of successful lung cancer screening program. We investigated the effectiveness and related factors of smoking cessation services provided to the participants in a population-based lung cancer screening trial.

MATERIALS AND METHODS

The Korean Lung Cancer Screening Project (K-LUCAS) is a nationwide, multi-center lung cancer screening trial that evaluates the feasibility of implementing population-based lung cancer screening. All 5,144 current smokers who participated in the K-LUCAS received a mandatory smoking cessation counseling. Changes in smoking status were followed up using a telephone survey in 6 months after lung cancer screening participation. The lung cancer screening's impact on smoking cessation is analyzed by variations in the smoking cessation interventions provided in screening units.

RESULTS

Among 4,136 survey responders, participant's motivation to quit smoking increased by 9.4% on average after lung cancer screening. After 6 months from the initial screening, 24.3% of participants stopped smoking, and 10.6% of participants had not smoked continuously for at least 6 months after screening. Over 80% of quitters stated that participation in lung cancer screening motivated them to quit smoking. Low-cost public smoking cessation program combined with lung cancer screening increased the abstinence rates. The smokers were three times more likely to quit smoking when the smoking cessation counseling was provided simultaneously with low-dose computed tomography screening results than when provided separately.

CONCLUSION

A mandatory smoking cessation intervention integrated with screening result counselling by a physician after participation in lung cancer screening could be effective for increasing smoking cessation attempts.

Association between job satisfaction and current smoking and change in smoking behavior: a 16-year longitudinal study in South Korea

BACKGROUND AND AIMS

Previous studies have found that job satisfaction is closely associated with various health outcomes of workers. Our study measured the association between job satisfaction and current smoking and change in smoking behavior.

DESIGN

Data from the longitudinal Korea Labor and Income Panel Study (KLIPS) that consist of nationally representative samples were used. The repeated measures analysis was conducted.

SETTING

South Korea, 2005-2021.

PARTICIPANTS

In total, 21 154 workers in Korea followed from 2005 to 2021 (145 120 observations) were included as study participants.

MEASUREMENTS

The main predictor variable, job satisfaction, was assessed using a five-item general job satisfaction questionnaire. Job satisfaction was classified into 'dissatisfied', 'neutral' and 'satisfied', according to the tertiles of the sum of scores. The outcomes of interest were current smoking and initiation and cessation of smoking in the subsequent year.

FINDINGS

Compared with those with a neutral level of job satisfaction, those who reported dissatisfaction with their job had an increased risk of smoking initiation [odds ratio (OR) = 1.11, 95% confidence interval (CI) = 1.01-1.22)]. Workers satisfied with their jobs were associated with a decreased likelihood of current smoking (OR = 0.96, 95% CI = 0.94-0.98) and smoking initiation (OR = 0.90, 95% CI = 0.81-0.99). There was a positive relationship between cumulative years of job dissatisfaction and smoking risk: > 4 years of experiencing job dissatisfaction was positively related to current smoking (OR = 1.14, 95% CI = 1.06-1.24) and smoking initiation (OR = 1.22, 95% CI = 1.00-1.49) and negatively related to smoking cessation (OR = 0.84, 95% CI = 0.72-0.99).

CONCLUSIONS

In Korea, job dissatisfaction appears to be associated with an increased risk of smoking initiation.

Smokers' strategies to reduce tobacco spending: self-reported use and differences across subgroups. Findings from the International Tobacco Control (ITC) Netherlands Survey

BACKGROUND

The cost of tobacco is one of the most reported reasons for smoking cessation. Rather than quitting, smokers can use also strategies to reduce tobacco expenditure while continuing smoking, such as smoking less or using price-minimising strategies. The Netherlands announced to increase the price of a pack cigarettes from seven (2018) to ten euros (2023), to reduce tobacco prevalence and consumption. This study explores the self-reported strategies to reduce tobacco spending among Dutch smokers, and whether this differed per age, income, and education. Additionally, we analysed among quitters in these subgroups whether price played a role in their decision to quit.

METHODS

Cross-sectional survey data from the International Tobacco Control (ITC) Netherlands Wave 2 (September-November 2020, N = 1915) was used. Strategies to reduce spending among smokers (N = 1790) were: reducing consumption, bulk buying, switching to cheaper products or buying from low-taxed sources. These were collapsed into: reducing consumption (solely or in combination with other behaviours), solely price-minimising behaviours (such as buying cheaper brands), or no strategies to reduce spending. Associations between strategies and characteristics were analysed through multinomial and binary logistic regression models. Second, we explored which subgroups were more likely to report that price played a role in their decision to quit among quitters (N = 125).

RESULTS

The majority of smokers used strategies to reduce tobacco spending: 35.6% reduced consumption and 19.3% used solely price-minimising strategies. 82.1% of quitters reported that price played a role in their decision to quit. Low-income individuals were more likely to report price as a reason for quitting and reduce consumption, but also to buy cheaper products. Highly nicotine dependent smokers were more likely to use price-minimising behaviours, and less likely to reduce consumption.

CONCLUSIONS

The majority reported using strategies to reduce spending or that price played a role in their decision to quit. Reducing consumption was the most reported strategy. Low-income smokers were more likely to reportedly reduce consumption, buy cheaper products, or quit. Price policies have the potential to reduce socioeconomic inequalities in smoking. To discourage price-minimising behaviours, such as switching to cheaper products, reducing price differences between products should be prioritized.

A 114% Cigarette Tax Hike and Drinking Behavior: Results From Nationally Representative Longitudinal Panel Data in Korea

This study investigated whether or not drinking behavior changed among Korean adult smokers after a 114% cigarette tax hike in 2015. Data were drawn from waves 9 to 12 (collected yearly from 2014 to 2017) of the nationally representative longitudinal study, the Korean Welfare Panel Study. Korean adults who were ≥19 years comprised the analysis sample (N = 10 875). We applied a difference-in-differences approach to compare drinking behavior before and after the tax increase among three groups (ie, quitters, continued smokers, and nonsmokers). We found that alcohol drinking significantly decreased among those who quit smoking after the tax increase, compared with nonsmokers ( P = .022). Our findings support that a cigarette tax increase may have the beneficial spillover influence of reduction in drinking as well as smoking if the tax increase can induce smokers to quit, but such positive spillover influence may be short-term or null for continued smokers.

Gender and tobacco epidemic in South Korea: implications from age-period-cohort analysis and the DPSEEA framework

OBJECTIVES

To understand a 20-year trend of gender-specific smoking prevalence among adults in South Korea.

DESIGN

Age-period-cohort analysis using the intrinsic estimator method was applied to examine the separate contribution of age, period and cohort effect on smoking prevalence. The Driving Force-Pressure-State-Exposure-Effect-Action (DPSEEA) framework was used to explain the observed smoking trends by mapping potential determinants and to address policy implications.

SETTING

General adult population in South Korea.

PARTICIPANTS

34 828 men and 43 632 women who aged 19-78 years, were not currently pregnant and were without a prior diagnosis of cardiovascular disease or cancer.

OUTCOME MEASURES

Gender-specific current smoking prevalence using the 1998-2017 Korea National Health and Nutrition Examination Survey.

RESULTS

Our results showed gender-specific age and birth cohort effects. More specifically, the smoking prevalence peaked at their mid-20s (prevalence rate ratio (PRR): 1.54, 95% CI: 1.49 to 1.59) and cohort born in 1959-1963 (PRR: 1.63, 95% CI: 1.57 to 1.70) and then decreased in men. On the other hand, in women, the smoking prevalence consistently increased until their mid-40s (PRR: 1.53, 95% CI: 1.27 to 1.84) and in recent birth cohort groups (PRR in 1994-1998 cohort: 1.55, 95% CI: 1.13 to 2.13). The period effects declined from 1998-2002 to 2003-2007, following increasing fluctuations in both genders. The smoking-DPSEEA framework showed the absence of policy actions to target female smokers and emphasised a proactive approach that tackles the upstream causes for smoking in women.

CONCLUSIONS

Men and women are clearly in different phases of the smoking epidemic in Korean population, and gender-tailored policies should be implemented.

Tobacco Taxation Influences the Smoking Habits of Adult Smokers Attending Smoking Cessation Clinic in Saudi Arabia

Objectives

To determine whether the increased tobacco price due to tax implementation on tobacco products (including cigarettes) has a significant effect on smoking cessation among Saudi Arabian adult smokers.

Methods

An interviewer-administered questionnaire was used to obtain data from adult Saudi smokers and recent quitters attending smoking cessation clinics between January 2018 and September 2019. The responses of the participants were summarized and analyzed.

Results

In total, 660 participants were interviewed, of which 98% were men who resided in the western region (33%). Taxation had no effect on smoking in 387 participants [58.6%; 95% confidence interval (CI): 54.9, 62.4], some effect in 220 participants (33.3%; 95% CI: 29.7, 36.9), and a substantial effect in 50 participants (7.6%; 95% CI: 5.6, 9.6). Strategies adopted to cope with the tax implementation included cutting down on the number of cigarettes smoked (302; 45.8%), changing to a cheaper brand of cigarette (151; 22.9%), purchasing in bulk (105; 15.9%), attempting to quit (453; 68.6%), and doing nothing (108; 16.4%). The rate of quitting smoking after attending the clinic was 20.7% (95% CI: 17.7, 23.9). Occupation (P = 0.003), education (P = 0.03), and current smoking habit (P = 0.07) were significantly associated with the impact of tobacco taxation. The strategies adopted in response to tax implementation on cigarettes were significantly associated with occupation (χ2 = 30, degrees of freedom = 12, P < 0.001).

Conclusions

Tobacco taxation influenced 40% of the participants. Their attempts to opt for alternatives should be recognized in evaluating policies to reduce adverse health impacts caused by tobacco abuse.

Smoking-related behaviour changes among Korean men after the 2015 tobacco price increase: assessing the implications for the tobacco endgame using a reconstructed retrospective cohort study

OBJECTIVES

To examine the effect of Korea's 2015 tax policy, discuss its effectiveness and limitations and present future directions for tax policy in the context of the tobacco endgame.

DESIGN

A retrospectively reconstructed cohort study.

SETTING

Korea, August 2014-October 2015.

PARTICIPANTS

The study examined 41,605 male smokers aged 19 years and older who participated in the 2015 Korea Community Health Survey.

MEASURES AND ANALYSIS

Binary and multinomial logistic regression was used to assess the impact of the tax policy on smoking-related behaviour. We adjusted for demographic and health-related variables.

RESULTS

Among 41,605 men who were smokers in 2014, 15,499 (35.85%, weighted) reported being affected by the price increase. Of all smokers, 1,772 (3.96%, weighted) reported quitting smoking because of the tobacco price increase. Others reduced their smoking amount (n=9,714, 22.48%, weighted) or made other changes such as switching brands (n=4,013, 9.41%, weighted). An additional 2,401 smokers (5.72%, weighted) quit smoking for reasons other than the tobacco price increase. Compared with those in the highest quintile of household income, the odds that those in the lowest quintile quit smoking due to the price increase were almost twice as high (OR=1.98, 95% CI 1.54 to 2.54).

CONCLUSIONS

Korea's 2015 tobacco price increase affected a significant number of smokers within a year, especially in the lowest income group, inducing some to quit or reduce their smoking amount. However, more smokers quit for reasons independent of the price change. Tax policy can effectively reduce smoking, but needs to be combined with other policies for optimal results.

Effects of morbidity on smoking cessation: a national smoking cessation program

Background

In smokers with chronic diseases, we examined the abstinence rates over 6 months and its affecting factors in the context of the Korea National Health Insurance Service (NHIS) smoking cessation program.

Methods

To identify 6-month abstinence, we extracted a sample of 15,017 participants using the multi-stage stratified cluster sampling method from the 359,047 individuals enrolled in the 2016 NHIS smoking cessation program and 1500 smokers responded to the telephone survey. From this group, 1245 individuals (48.50 ± 12.55 years; men 89.8%) were enrolled, as they had no missing information for confounding variables. We compared chronic disease distribution between participants and current smokers in the 2016 Korea National Health and Nutrition Examination Survey. We evaluated the factors affecting continuous abstinence rate (CAR) across patients with different chronic diseases: hypertension, diabetes mellitus (DM), dyslipidemia (DL), chronic obstructive pulmonary disease, and major depressive disorder (MDD).

Results

While participation of DM patients was high, the participation of DL patients was relatively low. The CAR over 6 months was 44.74%. The adjusted odds ratio (OR) for continuous abstinence over 6 months was significantly lower in the MDD group than in the no-MDD group (OR 0.43, 95% confidence interval [CI] 0.21 to 0.85). The factors of program completion (complete versus incomplete: OR 3.11, 95% CI 2.43 to 3.98), region (non-metropolitan areas versus Seoul metropolitan area: OR 1.28, 95% CI 1.01 to 1.61), and nicotine dependence (severe versus light or moderate: OR 0.64, 95% CI 0.50 to 0.83) were significantly associated with CAR.

Conclusions

The smoking cessation program was not actively recruiting smokers with chronic diseases. The CARs in each disease group were not different from those in the non-disease groups, except that the MDD group had a lower CAR over 6 months than the no-MDD group. Recruiting smokers with chronic diseases and improving their CARs depends on the careful identification of their characteristics.

Smoking, urinary cotinine levels and incidence of visual impairment

The longitudinal relationship between smoking status and risk of developing visual impairment (VI) remains unclear. We examined the relationship of smoking status and urinary cotinine level, an objective measure of smoking, with incidence of VI. This cohort study included 279,069 individuals free of VI who were followed for up to 8.8 years (median 4.8 years). VI was defined as when bilateral visual acuity was worse than 0.5 (cutoffs of 0.3 Logarithm of the Minimum Angle of Resolution). During 1,324,429.8 person-years of follow-up, 7852 participants developed new-onset bilateral VI. Self-reported current smoking status was associated with increased risk of developing VI in both men and women, with a stronger association in women (P for interaction = 0.01). Multivariable adjusted hazard ratios (95% confidence intervals) for incident VI comparing current smokers to never-smokers were 1.14 (1.04–1.25) in men and 1.52 (1.28–1.80) in women. Urinary cotinine levels of ≥ 100 ng/ml were significantly associated with increased risk of incident VI, and these associations remained when introducing changes in urinary cotinine and other confounders during follow-up as time-varying covariates. Cigarette smoking assessed based on self-report and urinary cotinine level was associated with increased incidence of VI. Our findings identify smoking as an independent risk factor for VI.

Social Learning and Addiction

Social learning theory, as originally proposed by Albert Bandura, followed 2000 years of intellectual inquiry into the determinants of human behavior. Reciprocal determinism is a central component of this theory and proposes that human behavior is determined by functional relationships between (1) personal factors, (2) the external environment, and (3) the behavior itself. Using this model, drug addiction can be viewed as resulting from the functional relationships between an individual's personal characteristics, social environment, and drug-centric behaviors. In other words, addiction can be viewed as a chronically evolving biopsychosocial disorder, encompassing dimensions that are both internal and external to the individual. Effective treatment interventions should thus target all nodes of the model and the functional relationships between them, and they must constantly evolve with the progression of the disorder. An argument is thus constructed that emphasizes the need for an organized structure of metacontingencies, operating within an individual's social environment, that targets the functional relationships between the factors that drive drug use. Optimally, these metacontingencies would operate within socially connected individuals who have the power to control the functional relationships that influence drug use, the vested interest to monitor individual and collective outcomes, the skills to determine what moment-to-moment decisions are needed to influence behavioral change, and the relative permanence necessary to carry through with the implementation of new strategies to produce outcomes that are cumulatively significant.

The smoking paradox: exploring why attitudes toward cigarette smoking are a weak predictor of cigarette smoking

OBJECTIVE

An attitude change perspective represents a central line of research in the smoking literature. This line of research focuses on influencing individuals' attitudes toward smoking in order to alleviate the negative outcomes of smoking and to achieve positive smoking behaviours. This line of research, however, does not explain why attitudes toward cigarette smoking are a weak predictor of cigarette smoking, an indication of a smoking paradox. The current study introduces two domain-general factors to explore this smoking paradox.

DESIGN

We used an online survey and collected data from American subjects (n = 328) via a crowdsourcing platform, Amazon Mechanical Turk, in 2018.

RESULTS

We found that the association between attitude toward smoking and the likelihood of smoking is significantly weaker when individuals perceive a low probability of risk and/or believe that this probable risk will only occur in the distant future, after many years. These results suggest that smoking may not be consistent with attitude because individuals perceive low probability of risk and/or they temporally discount the occurrence of this probable risk.

CONCLUSION

The results suggest that novel strategies that incorporate the concepts of perceived risk probability and temporal discounting of the probable risk are needed for smoking cessation.

Effects of an 80% cigarette price increase on quit attempts, successful quitting and smoking intensity among Korean adult smokers: results from nationally representative longitudinal panel data

OBJECTIVES

South Korea implemented an unprecedented cigarette tax increase in 2015, raising its cigarette price by 80%. This study evaluated the extent to which the 2015 cigarette tax increase affected Korean adult smokers in terms of quit attempts, successful quitting and smoking intensity.

METHODS

Data were drawn from a nationally representative longitudinal study, the Korean Welfare Panel Study (waves 9-12, 2014-2017). Korean adults who smoked before the 2015 cigarette tax increase comprised the sample (n=2114). We used the multiple logistic regressions to examine factors of quit attempts and successful quitting and the generalised estimating equations to estimate changes in smoking intensity among continued smokers.

RESULTS

After the cigarette tax increase, 60.9% (n=1334) of baseline smokers attempted to quit and 34.7% of the attempters succeeded in quitting. The smokers aged ≥ 65 years and light smokers both attempted more (p<0.01) and succeeded more (p<0.05) in quitting than smokers aged 35-44 years and heavy smokers, respectively. The successful quitting was not significantly associated with income levels. Depressive symptoms, first cigarette use before age 19 and smoking a pack or more a day at baseline were associated with failures in quitting. Smoking intensity among continued smokers decreased after the cigarette tax increase (p<0.001), but such a decrease was not observed in light smokers, young smokers and high-income smokers.

CONCLUSION

The current study findings imply that the Korean government may consider implementing periodic increases in cigarette tax which should reflect the rate of inflation and income growth. Smoking cessation programmes need to address depressive symptoms.