how does cigarette smoke cause lung cancer The Many Dangers of Tobacco Use Health Problems Caused by Secondhand
Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC What Causes Lung Cancer, Is It Hereditary & Known Risk Factors 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 Smoking and cancer Fresh
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