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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 Tobacco and Cancer Cancer CDC What Does Your Garage and a Cigarette Have in Common? American Lung Association Carcinogenic mechanisms of smoking in lung cancer. Abbreviations: PAHs, Download Scientific Diagram Smoking Causes Cancer. But How? Genetics Generation
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