does the tar in cigarettes cause cancer harmful chemicals smoking directly damage lung cells, causing DNA mutations that increase risk. Over time, these damaged cells grow abnormally, leading to tumor formation in the lungs. Quitting smoking How Smoking and Nicotine Damage
How Smoking and Nicotine Damage Your Body FV Hospital A Year's Worth of Tar Model Tobacco carcinogens, their biomarkers and tobacco induced cancer Nature Reviews Cancer Tar PPTX
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