smoking cigarettes causes lung cancer because Cigarette What Are the Risk Factors
What Are the Risk Factors for Lung Cancer? StoryMD 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 Cancer and Tobacco Use Vital Signs CDC Cigarette Smoking Is the Main Cause of Lung Cancer HealthXchange It's Never Too Late to Break Free from Smoking
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