Smoking.
D000368:Aged; D006528:Carcinoma, Hepatocellular / Q000209:etiology; D006801:Humans; D008113:Liver Neoplasms / Q000209:etiology; D008875:Middle Aged; D010024:Osteoporosis / Q000209:etiology; D004364:Pharmaceutical Preparations / Q000378:metabolism; D012907:Smoking; D000074606:Smoking Prevention
D004364:Pharmaceutical Preparations