the charcoal adds more and there is evidence showing it is linked to heart disese, cancer, booth defects and the risk of sharing. a lot of people pass around the hookah pipe without changing the mouth piece and that increases the likelihood of you catching or spreading any disease whether that is a cold sore or the flu. if you put your mouth on something and pass it to another person it is a germ factory waiting to happen. reporter: part of the social event is not to change the mouth piece. that seems like it might be a good idea. reporter: i think so, too. very eye-opening. update on the story we have