title: Single and multiple drug opiate users: addicts or nonaddicts?
mesh_terms: D000328:Adult; D001741:Black or African American; D000367:Age Factors; D000661:Amphetamine; D001294:Attitude to Health; D001463:Barbiturates; D002140:California; D002641:Chicago; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009892:Opium; D012737:Sex Factors; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D019966:Substance-Related Disorders / Q000175:diagnosis* / Q000453:epidemiology
chemical_list: D001463:Barbiturates; D009892:Opium; D000661:Amphetamine