Seems like a useful belief anyway. Even if the RF itself doesn't do anything to his brain, the phone does cause all kinds of attention and addiction problems, so staying away from it is probably good. Say you had some kind of conditioned/psychosomatic thing where you'd throw up whenever you'd drink alcohol. Maybe it's "all in your head" and it could be cured? But it'll keep you from becoming an alcoholic, so why fight it.