I'm with you Kurt on the wonder factor. Maybe some day there will be proof one way or the other. I suggest all of us look forward to scientific proof. At the same time, we should always be skeptical about consensus. Consensus in fact, is not proof of anything. Consensus is more of a political activist type of word. Meanwhile, the clients I work for get the inspection addendum part of their real estate contract stuffed into their face. In that process, the concern of radon is presented to them. If they ask me to test for it, I can do it to the EPA protocol. To make sure I'm up to date on the subject, I maintain a NEHA NRPP cert. I never push radon testing. I wait for clients to ask for it.