Changes in co-use of alcohol and cannabis among Nordic adolescents in the 21st century: Results from the European School Survey Project on Alcohol and Other Drugs study.

INTRODUCTION: In the 21st century, there has been a decline in alcohol use among adolescents in most Nordic countries, while trends of cannabis use have diverged. We explore how alcohol and cannabis use, respectively, and co-use of the two substances, have changed among Nordic adolescents. Three hypotheses are used to frame the study: (i) cannabis use has substituted alcohol use; (ii) there has been a parallel decline in both substances; and/or (iii) there has been a 'hardening' of users, implying that alcohol users increasingly use cannabis. METHODS: Data from the European School Survey Project on Alcohol and Other Drugs, conducted among 15- to 16-year-olds in Denmark, Finland, Iceland, Norway and Sweden (N = 74,700, 49% boys), were used to explore trends of past-year alcohol and cannabis use in the period 2003-2019. RESULTS: The proportion of adolescents reporting alcohol use decreased significantly in all Nordic countries except Denmark. The proportion of those using cannabis only was low (0.0%-0.7%) and stable in all countries. The total number of substance use occasions declined among all adolescents in all countries but Denmark. Among alcohol users, cannabis use became increasingly prevalent in all countries but Denmark. DISCUSSION AND CONCLUSIONS: We found no support for the 'parallel decline hypothesis' in alcohol and cannabis use among Nordic adolescents. Partially in line with the 'substitution hypothesis', cannabis use accounted for an increasing proportion of all substance use occasions. Our results suggests that the co-use of alcohol and cannabis has become more common, thus also providing support to the 'hardening' hypothesis.

Mind the gap! Gender differences in alcohol consumption among Swedish ninth graders 1989-2021.

INTRODUCTION: To examine gender differences in drinking habits among Swedish ninth graders over the period 1989-2021. METHODS: Annual school surveys with nationally representative samples of ninth-grade students in Sweden covering the period 1989-2021, total sample of 180,538 students. Drinking habits were measured with self-reports of frequency and quantity of use and frequency of heavy episodic drinking. Differences between genders were compared annually and differences were tested using logistic and ordinary least square regression models with cluster robust standard errors. RESULTS: Small gender differences in the prevalence of alcohol use during the first part of the study period were followed by an increasing gap over the past decade with girls being more likely to drink alcohol than boys. Boys consumed larger amounts of alcohol than girls during the first three decades of the studied period but no gender differences were found in later years. Binge drinking was more prevalent among boys during 1989 to 2000 but no systematic gender difference was found during the past 15 years. DISCUSSION AND CONCLUSIONS: There used to be clear gender differences in drinking habits among ninth graders in Sweden with boys drinking more than girls. This gap has narrowed over the past three decades and among contemporary adolescents, no gender differences are found neither in binge drinking nor volume of drinking and the prevalence of drinking is even higher among girls.

Fathers' alcohol consumption and risk of substance-related disorders in offspring.

BACKGROUND: Few studies have assessed how children are affected by parental alcohol consumption without clinically diagnosed alcohol problems, especially in relation to more long-term and severe consequences. The aim is to investigate how fathers' alcohol use is related to the risk for substance-related disorders in offspring. METHOD: A prospective cohort study of 64 710 Swedish citizens whose fathers were conscripted for compulsory military training at ages 18-20 in 1969/70. Information on fathers' alcohol consumption, frequency of intoxication and apprehended for drunkenness, was collected during conscription. Offspring was followed for substance-related disorders from age 12 to end of follow up in 2009. RESULTS: All measures of fathers' alcohol use were significantly and positively associated with risk for substance-related disorders in offspring. The associations were to a large extent explained by other risk factors in childhood. In the fully adjusted model, those with fathers in the highest alcohol consumption quintile still had a 63% higher risk (HR=1.63 CI 1.26-2.12) of substance-related disorders compared to those whose fathers' reported abstinence. The highest risk was found among offspring to fathers with alcohol-related disorders or that had been apprehended for drunkenness, with a more than two-fold increased risk for substance-related disorders. CONCLUSIONS: Despite the lower risk found among offspring to fathers with sub-clinical drinking when compared to those with alcohol-related disorders, the former group accounts for a much larger proportion of all cases of substance-related disorders in the population, prompting universal prevention efforts targeting the level of total alcohol consumption in society.

Are the well-off youth in Sweden more likely to use cannabis?

INTRODUCTION AND AIMS: Results from previous research are inconsistent regarding the association between socioeconomic status (SES) and cannabis use among adolescents. Since there are risks associated with cannabis use, a social gradient in cannabis use may contribute to reproducing socioeconomic differences in life opportunities. The aim of this study was to assess the association between childhood SES and cannabis use among youth in Sweden. DESIGN AND METHODS: We used repeated cross-sectional data from three waves (2014-2016) of the Swedish national school survey among 11th graders. The analysis encompassed 9497 individuals in 668 school classes. Childhood SES was measured through parents' highest education, as reported by the students. Cannabis use was measured in terms of lifetime use and frequency of use. Data were analysed using multi-level mixed-effects Poisson regression. RESULTS: Adolescents with at least 1 parent with university/college education had 17% (incidence rate ratio 1.17, confidence interval 1.05, 1.30) higher risk of lifetime use of cannabis compared with those whose parents had no university/college education, adjusting for sex, SES of the school environment, academic orientation, truancy, risk assessment and parental permissiveness. Among life-time users of cannabis, risk for frequent cannabis use was 28% (incidence rate ratio 0.72, confidence interval 0.53, 0.97) lower for those with at least 1 parent with university or college education. DISCUSSION AND CONCLUSIONS: Childhood SES, in terms of parental education, was associated with cannabis use among Swedish adolescents. Adolescents from families with lower SES were less likely to ever try cannabis, but at higher risk for frequent use.

Social Inequalities in Harmful Drinking and Alcohol-Related Problems Among Swedish Adolescents.

AIMS: The study aims to examine how socio-economic status (SES) among youth is related to binge-drinking and alcohol-related problems using three SES indicators: (i) SES of origin (parental education level), (ii) SES of the school environment (average parental education level at student's school) and (iii) SES of destination (academic orientation). METHODS: Cross-sectional data on upper secondary students (n= 4448) in Sweden. Multilevel logistic and negative binomial regression were used to estimate the relationship between each SES indicator and binge-drinking and alcohol-related problems, respectively. RESULTS: Only SES of destination was significantly associated with binge-drinking, with higher odds for students in vocational programmes (OR= 1.42, 95% CI= 1.13-1.80). For the second outcome, SES of destination (rr=1.25; 95%CI=1.08-1.45) and SES of the school environment (rr=1.19, 95% CI=1.02-1.39) indicated more alcohol-related problems in vocational programmes and in schools with lower-educated parents. After adjustment for drinking patterns, the relationship remained for SES of the school environment, but became non-significant for SES of destination. CONCLUSION: Our results suggest that the SES gradient among youth is stronger for alcohol-related problems than for harmful drinking. By only focusing on SES differences in harmful alcohol use, researchers may underestimate the social inequalities in adverse alcohol-related outcomes among young people. Our findings also support the notion that the environment young people find themselves in matters for social inequalities in alcohol-related harm.

More Drinking, More Problems-Stable Association Between Alcohol Consumption and Harm Among Swedish Youth 1995-2012.

AIMS: Alcohol consumption among Swedish youth increased during the 1990s. In the following decade, levels declined coinciding with a reduction in the prevalence of self-reported alcohol-related harm. We examine how the trend in self-reported alcohol-related problems among young Swedish alcohol consumers has followed the trend in alcohol consumption during 1995-2012, and test whether the strength of the association between self-reported alcohol consumption and alcohol-related problems within individuals is inversely proportional to the overall level of consumption among youth. METHODS: The study was based on a representative survey on alcohol and drug habits among ninth-year students, consisting of current alcohol consumers (n = 68 863), 1995-2012. Negative binominal regression models were used to estimate the relationship between three consumption variables (average volume of consumption, binge drinking and heavy drinking) and self-reported alcohol-related problems. RESULTS: The prevalence of binge drinking showed a greater association with self-reported alcohol-related problems than did overall mean consumption. No noticeable variation in the strength of the individual-level alcohol and harm relationship was found over the study period. We found no significant interaction between the individual alcohol use measures and overall mean youth consumption. CONCLUSION: We found no signs of normalization; on the contrary, young alcohol consumers suffer about the same number of self-reported negative consequences from their drinking, regardless of the level of overall youth consumption. The study also suggests that binge drinking rather than overall consumption is the main factor that influences the development of self-reported problems experienced among young alcohol consumers. SHORT SUMMARY: Young alcohol consumers suffer about the same number of self-reported negative consequences from their drinking, regardless of the level of overall mean consumption in the youth population. Binge drinking consumption appears to be the main factor influencing the development of self-reported alcohol-related problems among young alcohol consumers.