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How does smoking cause cancer? Cancer Research UK 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 Tackling Indigenous Smoking Cigarette smoke contains more than 7,000 chemicals, including at least 250 known to be harmful and 69 that can cause cancer. Here are some Instagram Teens inhale cancer causing chemicals in e cigarettes Cigarette smoke contains more than 7,000 harmful chemicals, many of which are proven to cause cancer and other serious illnesses. Did you know that your local Stop Smoking Service can be easily Chemicals in Cigarettes: From Plant to Product to Puff FDA

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