is that the only risk factor, smoking? smoking is number one, that accounts for 90% of lung cancer cases. secondhand smoking is also as critical. so, if you re in the area where other people are smoking, you really want to pay attention to it. one of the things that came up is exposure to ray do radon, it exists in certain houses, certain states in this country have it, and it has no taste or odor, so it s very difficult to detect it. it can come from the water sources in the basement. so, that s another source of lung cancer. in fact, among the nonsmokers, jamie, the highest number of lung cancer cases. air pollution, exposure to chemicals and i know we re talking about the oil spills as we speak and fume and vapors from the benzene. major risk factors and finally some pills or vitamins, beta