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How Quitting Smoking Lowers Lung Cancer Risk and Other Illnesses 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 Smoking & Cancer Genetic Mechanism of How Cancer is caused by Smoking Cigarettes cause lung cancer Smoking is the major cause of COPD and lung cancer. Oxidants in Download Scientific Diagram Carcinogenic mechanisms of smoking in lung cancer. Abbreviations: PAHs, Download Scientific Diagram
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