Journal
INTERNATIONAL JOURNAL OF EPIDEMIOLOGY
Volume 46, Issue 5, Pages 1641-1650Publisher
OXFORD UNIV PRESS
DOI: 10.1093/ije/dyx065
Keywords
cannabis; education; longitudinal cohort; adolescent
Categories
Funding
- French National Research Agency (ANR)
- French Institute for Public Health Research-IReSP (TGIR Cohortes)
- French Inter-departmental Mission for the Fight against Drugs and Drug Addiction (MILDeCA)
- French Institute of Cancer (INCa)
- Pfizer Foundation
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Background: Adolescent cannabis use has been reported to predict later educational attainment; however, results of past studies may be confounded by inappropriate control for factors that make some youths more likely to use cannabis precociously than others. We aimed to test the possibility of a causal relationship between early cannabis initiation and later academic achievement. Methods: Analyses are based on data collected among TEMPO cohort study participants (France, 2009, n = 1103, 22-35 years). Participants were previously assessed in childhood (1991) and adolescence (1999); additionally, their parents had taken part in a longitudinal epidemiological cohort study (GAZEL). Early cannabis initiation was defined as use at age 16 or earlier. Educational attainment was defined as the completion of a high-school degree (Baccalaureat'). Early (up to and including age 16 years) and late (after age 16 years) cannabis-use initiators were compared with non-users using logistic regression models controlled for inverse probability weights (IPWs) of exposure calculated based on participants' socio-demographic, juvenile and parental characteristics. Results: In age-and sex-adjusted analyses, early cannabis initiators were more likely than non-users to have low educational attainment [odds ratio (OR): 1.77, 95% confidence interval (CI) 1.22-2.55]. In IPWs-controlled analyses, this association somewhat decreased (OR: 1.64, 95% CI 1.13-2.40). Late cannabis initiators did not have lower educational attainment than non-users. Early cannabis use and educational attainment appeared more strongly associated in young women than in young men. Conclusions: Early cannabis can cause low educational attainment. Youths who initiate cannabis use early require attention from addiction and education specialists to reduce their odds of poor long-term outcomes.
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