Rachael Malmberg was diagnosed with stage 4 lung cancer at age 31.
The former national-level U.S. hockey player had never smoked and had lived a perfectly healthy life.
Malmberg, who has since beaten the cancer, discovered both her current home and childhood homes tested positive for radon, a naturally occurring radioactive gas that can seep through people's basements. She and her doctor believe radon is the cause of her cancer....
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