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What causes lung cancer?

ANSWER

Smoking is the biggest reason. It’s responsible for about 85% of all cases. Some genetic glitches may put some people at higher risk. Secondhand tobacco smoke is also a cause. People who live with someone who smokes are 20% to 30% more likely to get lung cancer than those who live in a smoke-free home.

SOURCES: 

National Cancer Institute. 

National Institutes of Health. 

WebMD Medical Reference from the American College of Physicians: “Section 12 VIII Lung Cancer.”

Reviewed by Laura J. Martin on July 11, 2018

SOURCES: 

National Cancer Institute. 

National Institutes of Health. 

WebMD Medical Reference from the American College of Physicians: “Section 12 VIII Lung Cancer.”

Reviewed by Laura J. Martin on July 11, 2018

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What affects your risk for lung cancer?

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