do cigarettes have carcinogens 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 Cigarettes cause lung cancer

Cigarettes cause lung cancer How does smoking cause cancer? Cancer Research UK Cigarette smoke contains thousands of chemicals, many of which are toxic and harmful to the human body. Here's a detailed breakdown of some of the most dangerous constituents and their effects: 1. IARC Publications Website Tobacco Smoke and Involuntary Smoking

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