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The Difference Between Healthy Lungs and Smoker's Lungs How Smoking and Nicotine Damage Your Body FV Hospital Lung Cancer Treatment & Smoking Effects American Oncology 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 All Forms of Cigarette Smoke Exposure are Harmful to our Cells and DNA Thirdhand Smoke Resource Center

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