A random survey of cannabis use in young people.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001290:Attitude; D002188:Cannabis; D005260:Female; D006801:Humans; D008297:Male; D012494:Sampling Studies; D012737:Sex Factors; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014852:Wales