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The most important and common risk factor for lung cancer is smoking tobacco. Nearly 8 out of 10 of all lung cancers are smoking-related. The best way to decrease the risk is to quit smoking.
Exposure to secondhand smoke also increases the risk of lung cancer, increasing their risk of developing lung cancer by 20 percent to 30 percent. Secondhand smoke also increases the risk of heart disease and other ailments.
Other environmental substances or exposures that can increase the risk of developing lung cancer include: