Radon is the second leading cause of lung cancer behind smoking and if you don’t smoke, it is your leading cause of getting lung cancer.  The EPA estimates that radon kills more than 20,000 people every year.  It is naturally occurring and is produced by decaying uranium in the ground.  According to the State of WI, southeastern WI is a hotbed for radon, with estimates of between 10-40% of Southeastern WI homes having levels above the acceptable limit.