The statement "radio can possibly cause cancer" is irrelevant if it takes a signal so powerful no human would ever encounter it, let alone produce it. The question is whether radio signals used in telecommunications can cause cancer, especially compared to the waves already present in nature.
The people most at risk would (one would think) be people that have a cellphone glued to their ear all day. But these people would (or: do) also end up with damage to their hearing, so maybe that tempers behavior ?
