title: Assessing drug-taking as a problem: an English observation study.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002188:Cannabis; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors; D012923:Social Class; D012940:Social Problems; D012959:Socioeconomic Factors; D019966:Substance-Related Disorders