Smoking and health.
D000328:Adult; D000367:Age Factors; D000368:Aged; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012907:Smoking / Q000150:complications*