In the U.S., radon is the second leading cause of lung cancer deaths, the CDC reports, and the leading cause among non-smokers. Estimates blame radon for more than 21,000 lung cancer deaths annually.

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Estimates blame radon for more than 21,000 lung cancer deaths annually. Treating lung cancer brought on by radon can be difficult, the CDC says, as symptoms may not develop for years.

Over time, exposure to higher levels of radon could lead to lung cancer. In the U.S., radon is the second leading cause of lung cancer deaths, the CDC reports, and the leading cause among non-smokers.

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