how does tobacco cause lung cancer Smoking Cigarettes Causes DYK: The primary cause of

DYK: The primary cause of lung cancer is tobacco smoking. Non smokers who are exposed to tobacco smoke are also affected and have a 30% increased risk of developing lung cancer. Learn more Tobacco and Lung Cancer: The Science behind the Connection CK Birla Hospital The Unbreakable Link: Tobacco and Lung Cancer Smoking is the number one cause of lung cancer. It causes about 90% of lung cancer cases. Tobacco smoke contains many chemicals that are known to cause lung cancer. If you still

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