A test of Lindesmith's theory of addiction: the frequency of euphoria among long-term addicts.
D000293:Adolescent; D000328:Adult; D005059:Euphoria / Q000187:drug effects; D005260:Female; D006801:Humans; D008297:Male; D008954:Models, Biological; D008960:Models, Psychological; D009042:Motivation; D009892:Opium / Q000494:pharmacology; D011600:Psychopharmacology; D012054:Reinforcement, Psychology; D013375:Substance Withdrawal Syndrome; D019966:Substance-Related Disorders / Q000209:etiology*
D009892:Opium