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Smoking & Lung Cancer: How Cigarettes Damage Your Lungs Smoking WILL Cause Fatal Cancer! 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 Does Smoking Cause Cancer Consensus Academic Search Engine Smoking is the number one cause of lung cancer. It causes about 90% of lung cancer cases. Tobacco smoke contains many chemicals that are known to cause lung cancer. If you still Your Body on Cigarettes: The First Drag to Lung Disease

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