tobacco smoke contains over 70 carcinogens carcinogens, their biomarkers and tobacco-induced cancer Second hand smoke contains almost
Second hand smoke contains almost 70 known carcinogens. People who have never smoked in their life are still at risk, just from being in the room. Quitting tobacco isn't only for yourself. Health effects of smoking tobacco Wikipedia How Do Cigarettes Cause Cancer? Memorial Sloan Kettering Cancer Center Tobacco smoke and it's effects on gas exchange PPTX
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