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 Does Only Smoking Cause Lung

Does Only Smoking Cause Lung Cancer? Myths vs. Facts Quitline NC Smoking cigarettes is a major cause of lung cancer. Did you know that secondhand tobacco smoke is the third most common cause of lung cancer? There's never been a better How Do Cigarettes Cause Cancer? Memorial Sloan Kettering Cancer Center Tobacco and Cancer Cancer CDC

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