title: Twin studies on substance abuse: an overview.
mesh_terms: D000428:Alcohol Drinking; D000437:Alcoholism / Q000235:genetics / Q000523:psychology; D004200:Diseases in Twins; D004777:Environment; D005260:Female; D006801:Humans; D010551:Personality; D011247:Pregnancy; D012107:Research Design; D012907:Smoking; D019966:Substance-Related Disorders / Q000235:genetics* / Q000523:psychology; D014427:Twins / Q000523:psychology