how does tobacco cause lung cancer Treatment & Smoking Effects Smoking is the number one
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 Causes and Risk Factors of Lung Cancer 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 How does smoking cause cancer? Cancer Research UK Tobacco and Cancer Cancer CDC Smoking Cigarettes Causes Lung Cancer
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