how does cigarette smoke cause lung cancer The harmful chemicals in smoking 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 Health Problems Caused by Secondhand
Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Smoking Effects on Lungs Types of Smoke Impact on Cancer What happens to your lungs from smoking? UT MD Anderson Preventing Chronic Disease: April 2007: 06_0024 All Forms of Cigarette Smoke Exposure are Harmful to our Cells and DNA Thirdhand Smoke Resource Center
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