title: Early exposure to marijuana and risk of later drug use.
authors.forename: Peter
authors.initials: P
authors.lastname: Cummings
mesh_terms: D006801:Humans; D002189:Marijuana Abuse / Q000150:complications*; D016017:Odds Ratio; D012307:Risk Factors; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000209:etiology*