Please cite one documented case of any human being who was ever harmed in any way by smoking one tobacco cigarette . . even for as much as a lifetime. And yes, some people can smoke all their lives and die of old age but that doesn't mean smoking is not widely believed by experts to be harmful to health. Besides, your comment is designed to distract people from the real point, which is that using fluoride - or smoking - is a personal choice - as it should be.