title: Changes in the patterns of drug use in two Canadian cities: Toronto and Halifax.
mesh_terms: D000293:Adolescent; D001463:Barbiturates; D002170:Canada; D002188:Cannabis; D005260:Female; D006213:Hallucinogens; D006801:Humans; D008238:Lysergic Acid Diethylamide; D008297:Male; D009864:Ontario; D009892:Opium; D010947:Plants, Toxic; D012494:Sampling Studies; D012737:Sex Factors; D012907:Smoking; D013334:Students; D019966:Substance-Related Disorders; D014026:Nicotiana; D014149:Tranquilizing Agents; D014505:Urban Population
chemical_list: D001463:Barbiturates; D006213:Hallucinogens; D014149:Tranquilizing Agents; D009892:Opium; D008238:Lysergic Acid Diethylamide