Smoking: the number one health problem.
D002273:Carcinogens; D006801:Humans; D007878:Legislation as Topic; D009369:Neoplasms / Q000209:etiology; D012306:Risk; D012907:Smoking; D000074606:Smoking Prevention; D014028:Tobacco Smoke Pollution; D014481:United States
D002273:Carcinogens; D014028:Tobacco Smoke Pollution