American Cancer Society

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As many as 20% of the people who die from lung cancer in the United States every year do not smoke or use any other form of tobacco. This translates to about 16,000 to 24,000 Americans every year. In fact, if lung cancer in non-smokers had its own separate category, it would rank among the top 10 fatal cancers in the United States.

It’s still true that staying away from tobacco is the most important thing any of us can do to lower our risk of getting lung cancer. But there are also other risk factors. Researchers have made a lot of progress over the past decade in understanding what causes lung cancer in non-smokers:

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