The reinforcers for drug abuse: why people take drugs.
D000661:Amphetamine; D000431:Ethanol; D006213:Hallucinogens; D006801:Humans; D006993:Hypnotics and Sedatives; D008691:Methadone / Q000627:therapeutic use; D009294:Narcotics; D011613:Psychotherapy; D012054:Reinforcement, Psychology; D019966:Substance-Related Disorders / Q000628:therapy
D006213:Hallucinogens; D006993:Hypnotics and Sedatives; D009294:Narcotics; D000431:Ethanol; D000661:Amphetamine; D008691:Methadone