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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 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 Does smoking weed cause lung cancer? Smoking causes lung cancer Mauritius Tobacco and Lung Cancer: The Science behind the Connection CK Birla Hospital

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