Well, fear is an emotion, is not rational. On the contrary I believe it is very rational to fear radon. In Spain or France it is normal for families in some pl

Well, fear is an emotion, is not rational. On the contrary I believe it is very rational to fear radon. In Spain or France it is normal for families in some places to have family wineries on caves. In those places if there was radon(coming from minerals associated to granites) cancer was way higher than normal levels. You have to be careful to ventilate those caves when they stay closed for some time. My family had one of those. As there are lots of scientists in my family, we were always careful, including using a geiger counter and controlling how much time we played there as kids(it was a very fun place to play) but I had seen pretty stupid people about it(neighbors, friends), their stupidity coming from ignorance. And I had seen people getting ill from cancer and dying too. It doesn't hurt to be careful.