I blame this on global warming.
RADON is a crock of BS. There has never been ONE SINGLE documented case of any cancer directly related to RADON EVER. Radon gas was ginned up by the EPA and the original studies were from miners who were underground for 8 hours per day breathing in mines where there was some radon. These fine gents also smoked a couple packs of lucky strikes or marlboros each day. It is all made up. About as real as global warming.
I am a Realtor in Michigan.