title: Progression time to narcotic use in a Southwestern addict population.
mesh_terms: D001741:Black or African American; D001463:Barbiturates; D005260:Female; D006556:Heroin Dependence / Q000209:etiology*; D006801:Humans; D008297:Male; D012737:Sex Factors; D019966:Substance-Related Disorders / Q000150:complications*; D013781:Texas; D013997:Time Factors
chemical_list: D001463:Barbiturates