The Medical Detective looked into the five radiation controversies women are most worried about these days to get to the truth about what’s really dangerous.

Radon: While most background radiation is too weak to be harmful, there’s a common source of radiation danger from the earth you should beware of: radon, an invisible radioactive gas responsible for thousands of lung cancer deaths each year.

The Medical Detective was surprised to learn that radon is the second-leading cause of lung cancer in the U.S., after smoking, according to the EPA.

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