Hasn't that been done? I don't know of any public building that you can smoke in, and many businesses don't allow it on the property. In the city where I worked it was code on all new dwellings to install radon alarms. So with what you are saying, is it is okay to pollute the air if you want to buy an older tractor, just as you can smoke on your property, and breath radon gases if you don't want to know if it is under your house. But if you want a new tractor, eat, work, and socialize in a public building, then you have to play by the rules.