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What about the NPR Story on Radon?

We have always said that smoking is a significant factor in radon-related lung cancer deaths
All of the 21,000 radon-related lung cancer deaths per year are attributable to radon exposure, even for smokers.
Even if we ignored the smokers who get radon-induced lung cancer, 3,000 non-smokers die from radon exposure each year. Radon is the number 1 cause of lung cancer deaths in non-smokers.
While smoking is an individual choice and an individual risk, radon is not. Everyone in a home with high levels is exposed, The individual decision to not test or not fix affects the rest of the family.
While it is true that radon is not distributed equally throughout the U.S., high homes have been found in all states. The only way to know your level is to test.

Read "A Citizen's Guide to Radon" (PDF) to help protect you and your family from radon.