Passive smoking.
D000328:Adult; D003367:Cotinine / Q000652:urine; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology / Q000235:genetics; D008297:Male; D008393:Marriage; D012306:Risk; D014028:Tobacco Smoke Pollution
D014028:Tobacco Smoke Pollution; D003367:Cotinine