title: Smoking and lung cancer: some unresolved issues.
mesh_terms: D000230:Adenocarcinoma / Q000209:etiology; D002294:Carcinoma, Squamous Cell / Q000209:etiology; D002784:Cholesterol / Q000378:metabolism; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D009748:Nutrition Disorders / Q000150:complications; D012306:Risk; D012907:Smoking; D000074606:Smoking Prevention; D014028:Tobacco Smoke Pollution; D014481:United States; D014801:Vitamin A / Q000378:metabolism
chemical_list: D014028:Tobacco Smoke Pollution; D014801:Vitamin A; D002784:Cholesterol