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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 does smoking cause cancer? Cancer Research UK Smoking causes lung cancer Back of pack Australia Did you know? According to the CDC, about 80 90% of lung cancers are linked to smoking. That means giving up cigarettes can significantly drop your chances of developing lung cancer. It doesn't Smoking causes lung cancer Brunei Darussalam

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