title: Immediate precursors to heroin addiction.
mesh_terms: D000328:Adult; D005260:Female; D003932:Heroin; D006801:Humans; D008297:Male; D009021:Morphine Dependence / Q000209:etiology*; D012959:Socioeconomic Factors; D019966:Substance-Related Disorders
chemical_list: D003932:Heroin