Living in a polluted city is not a greater risk for lung cancer than smoking a pack of cigarettes a day. Air pollution is actually far less likely to cause lung cancer than smoking cigarettes. Being a smoker, or even being frequently exposed to second hand smoke is more dangerous than the level of air pollution encountered in US cities. In fact, about 87% of lung cancers are thought to result from smoking or passive exposure to tobacco smoke.
http://www.cancer.org/myacs/eastern/areahighlights/5-most-common-cancer-myths
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