CAUSE



 * Causes of Lung Cancer **


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** Smoking **  Cigaratte has about 4,000 chemical compounds that causes cancer about 90% of lung cancer is because of use of tobacco. **Secon-hand smoking **

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Inhaling the smoke from other smokers, and about 3,000 deaths of lung cancer per year in the U.S is because of second-hand smoking. ===== 
 * Radon gas**

about 15,000~22,000 deaths of lung cancer is caused by radon gas.
**Lung diseases** Diseases such as chronic obstructive pulmonary disease (COPD) is most likely to cause lung cancer. 
 * Air pollution**

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Air pollution from vehicles, industry, and power plants can cause lung cancer, causing about 1% deaths of lung cancer in the U.S annually is caused by air pollutions. =====

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<span style="font-size: 110%; font-family: Verdana, Geneva, sans-serif;">//<span style="font-size: 110%; font-family: Verdana, Geneva, sans-serif;">Quiz: what causes most of lung cancer? //
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