Age of initial drug use and subsequent preference for other drugs.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006556:Heroin Dependence; D006801:Humans; D008297:Male; D010947:Plants, Toxic; D011336:Probability; D012044:Regression Analysis; D012907:Smoking; D019966:Substance-Related Disorders; D014026:Nicotiana