title: Early exposure to marijuana and risk of later drug use.
authors.forename: John
authors.initials: J
authors.lastname: Macleod
authors.forename: Matthew
authors.initials: M
authors.lastname: Hickman
authors.forename: George Davey
authors.initials: GD
authors.lastname: Smith
mesh_terms: D006801:Humans; D002189:Marijuana Abuse / Q000150:complications*; D012307:Risk Factors; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000209:etiology*