does smoking cigarettes cause lung cancer The harmful chemicals in directly damage cells, causing DNA mutations that increase risk. Over time, these damaged cells grow abnormally, leading to tumor formation in the lungs. Quitting smoking Give It Up: Cutting back

Give It Up: Cutting back helps, but even a cigarette or two a day carries risks What You Need to Know About Smoking and Lung Cancer If you were asked about tobacco and cancer, you might think of lung cancer. It's true that smoking cigarettes and being exposed to other people's cigarette smoke cause almost 9 of every How does smoking cause cancer? Cancer Research UK

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