title: The epidemiology of drug abuse.
mesh_terms: D004812:Epidemiologic Methods; D006556:Heroin Dependence / Q000188:drug therapy / Q000453:epidemiology / Q000517:prevention & control; D006801:Humans; D008691:Methadone / Q000627:therapeutic use; D008887:Military Medicine; D009294:Narcotics; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014481:United States; D014744:Vietnam
chemical_list: D009294:Narcotics; D008691:Methadone