title: Heroin use in Niagara Falls, Ontario.
mesh_terms: D001290:Attitude; D003365:Costs and Cost Analysis; D005260:Female; D006556:Heroin Dependence / Q000453:epidemiology; D006801:Humans; D007398:Interpersonal Relations; D008019:Life Style; D008297:Male; D009042:Motivation; D009864:Ontario; D010379:Peer Group; D011619:Psychotropic Drugs; D012926:Social Control, Formal; D019966:Substance-Related Disorders / Q000453:epidemiology
chemical_list: D011619:Psychotropic Drugs