title: "Get high with a little help from my friends": implications of the historical covariation of cannabis use and evenings out.
authors.forename: John E
authors.initials: JE
authors.lastname: Schulenberg
authors.forename: Patrick M
authors.initials: PM
authors.lastname: O'Malley
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D033062:Friends; D006801:Humans; D007398:Interpersonal Relations; D008385:Marijuana Smoking / Q000517:prevention & control / Q000523:psychology*