how does smoking tobacco cause lung cancer Health effects of DYK: The primary cause of

DYK: The primary cause of lung cancer is tobacco smoking. Non smokers who are exposed to tobacco smoke are also affected and have a 30% increased risk of developing lung cancer. Learn more 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 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 Health Risks of Smoking Tobacco American Cancer Society

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