does tar in cigarettes cause cancer The 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 Smoking and cancer | Fresh

Smoking and cancer Fresh Lung cancer is dangerous for several reasons, and a number of factors make it particularly deadly. According to experts, smoking has become very common these days and is one of the main Smoking: Effects, Risks, Diseases, Quitting & Solutions Marketed as a "healthier" choice, "light" cigarettes now Linked to rise in lung cancer Roswell Park Comprehensive Cancer Center Buffalo, NY

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