title: The escalation theory reconsidered: drugtakers in an English town.
mesh_terms: D000293:Adolescent; D000328:Adult; D000661:Amphetamine; D002188:Cannabis; D004651:Employment; D004739:England; D005260:Female; D006801:Humans; D008019:Life Style; D008238:Lysergic Acid Diethylamide; D008297:Male; D012737:Sex Factors; D012923:Social Class; D019966:Substance-Related Disorders
chemical_list: D008238:Lysergic Acid Diethylamide; D000661:Amphetamine