|The aim of the present study was to compute trajectories of alcohol and drug use among French Canadian adolescent boys from low SES families. A semi-parametric mixture model was used to analyze data from a sample of 1037 boys, part of an ongoing longitudinal study in Montreal, Canada. Subjects were assessed yearly on substance use between the ages of 10 and 16. Alcohol, marijuana and hard drugs consumption were examined. Trajectories observed for the different substances were compared, and trajectories for general substance use were examined as well. The pertinence of examining substances separately when computing trajectories of use, and the methodological and conceptual issues involved in combining them are discussed.
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