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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 How cigarette smoke skews immune responses to promote infection, lung disease and cancer Nature Reviews Immunology Quit Smoking health harms worse than we thought, new ANU study of Smoking is the major cause of COPD and lung cancer. Oxidants in Download Scientific Diagram

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