how does smoking cigarettes cause lung cancer The harmful chemicals in 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 Stopping smoking could halt further
Stopping smoking could halt further damage to lungs CRUK CC Smoking: The Main Cause of Lungs Cancer Smoking and its effect on the breathing system Cancer and Tobacco Use Vital Signs CDC
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