how does smoking tobacco cause lung cancer causes Lung Cancer: Causes, Symptoms, Stages,
Lung Cancer: Causes, Symptoms, Stages, Treatment, Prevention Smoking causes lung cancer 2 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 and its effect on the breathing system How Quitting Smoking Lowers Lung Cancer Risk and Other Illnesses
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