can cigarettes cause lung cancer The harmful chemicals in smoking directly damage cells, causing DNA mutations that increase risk. Over time, these damaged cells grow abnormally, leading to tumor formation in the lungs. Quitting smoking What Is Smoker Lung? Difference
What Is Smoker Lung? Difference Between Healthy Lungs Lung Cancer Warning Signs StoryMD Non smokers' lung cancer may be different Give It Up: Cutting back helps, but even a cigarette or two a day carries risks
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