How can radon hurt my health?
Radon is the second leading cause of lung cancer in Canada. Radon exposure is estimated to be the cause of 16% of lung cancers.
If you live in a building with high radon levels (or if you spend a lot of time in one), you are at higher risk for lung cancer. Radon is the second most common cause of lung cancer, after smoking.
If you smoke and you live in a home with a high level of radon, you are at an even higher risk for lung cancer.
（http://www.lung.ca/protect-protegez/pollution-pollution/indoor-interieur/radon-radon_e.php）
看吸烟不能只看现在的吸烟率。从吸烟到发病有一个漫长的过程。
