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The harmful chemicals in smoking directly damage lung cells, causing DNA mutations that increase cancer risk. Over time, these damaged cells grow abnormally, leading to tumor formation in the lungs. Quitting smoking What Causes Lung Cancer, Is It Hereditary & Known Risk Factors Smoking is one of the leading causes of lung cancer and every cigarette harms your lungs more than you realize. Tobacco smoke contains harmful chemicals that damage lung cells over Smoking and Lung Cancer Tips to Quit Smoking

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