how does cigarette smoke cause cancer The harmful chemicals in 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 Cigarettes contain thousands of chemicalsover 7,000 have been identifiedmany of which are toxic, and at least 70 are known to cause cancer. When a cigarette burns, these chemicals are inhaled deep Tobacco carcinogens, their biomarkers and tobacco induced cancer Nature Reviews Cancer How tobacco* impacts your health

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