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Previous studies have suggested that non-smokers may be at greater risk for air pollution-related lung cancer incidence/mortality than current smokers. While smoking is an important risk factor, previous data suggest that, at diagnosis, only 39% of patients with lung cancer are current smokers (drops to 14% at 5 months after diagnosis).It also begs the question: how many of those 39% got lung cancer from some cause other than smoking? If you smoke and get cancer, your cancer is considered smoking-related. But it makes sense to consider that some smokers get lung cancer for the same reason that non-smokers get it. In fact, given the data above, it's possible that smoking is not even the leading risk factor for lung cancer. See:
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