do cigarettes have carcinogens 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 - How Tobacco Smoke
Cancer How Tobacco Smoke Causes Disease: The Biology and Behavioral Basis for Smoking Attributable Disease NCBI Bookshelf What chemicals are in a cigarette? What does smoking do to your body? Cancer Research UK Health Effects of Cigarettes: Cancer Smoking and Tobacco Use CDC Cigarettes cause lung cancer
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