[Mixed abuse of drugs by adolescents].
D000293:Adolescent; D000428:Alcohol Drinking; D006801:Humans; D002189:Marijuana Abuse / Q000453:epidemiology; D009664:Norway; D012907:Smoking; D019966:Substance-Related Disorders / Q000453:epidemiology
Blandingsmisbruk av rusmidler blant ungdom.