The simultaneous use of alcohol and cannabis is common among adolescents, but has been little studied. In this study, we examine predictors and consequences of this behavior in a population-based sample of high school students.
Self-reports were obtained from students in Quebec (Canada) followed throughout high school (N = 6 589). Logistic regressions were used to test the association between individual, family, and peer-related predictors in grades 7–8 and simultaneous alcohol and cannabis use in grade 10, as well as between simultaneous alcohol and cannabis use in grade 10 and substance-related problems of various types (legal, physical, etc. in grade 11.
Most predictors in grades 7–8 were associated with simultaneous alcohol and cannabis use in grade 10. Only variables reflecting early-onset substance use involvement - binge drinking, cannabis use, and drug use by close friend(s) – remained predictive in a multivariate model.
Simultaneous alcohol and cannabis use was associated with increased substance-related problems in grade 11, above and beyond baseline problems in grade 10 and the concurrent use of the two substances in separate episodes.
Simultaneous alcohol and cannabis use 1) is anticipated by multiple psychosocial risk factors which come together with individual and peer substance use in early high school and 2) is independently predictive of subsequent substance-related problems. Providing adolescents with adequate information regarding the potential harm of simultaneous use is imperative.
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