Are non-smokers at equal risk of developing lung cancer?

The short answer to that is “Of course not!” The long answer to that is to understand why not? But first, why do non-smokers get lung cancer? The causes can be because of second-hand smoke – ie constant exposure to others smoking. Studies have shown that up to a third of non-smokers get lung cancer because of secondhand smoke. Other causes are exposure to a lot of industrial air pollutants, asbestos and radon, and those who have a genetic predisposition for lung cancer.
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