title: Competing theories of marijuana use: a longitudinal study.
mesh_terms: D000293:Adolescent; D000328:Adult; D002188:Cannabis; D005260:Female; D006801:Humans; D008297:Male; D008960:Models, Psychological; D010379:Peer Group; D012933:Social Identification; D013334:Students; D019966:Substance-Related Disorders / Q000523:psychology*