That's a good question, Tracy. I think that most of the mercury vapour released is inhaled by the host (i.e. the one with fillings) but if someone is close to them (or kissing etc) then I think it quite possible (or likely) that they might get some exposure. However, I don't know if would be enough to make them sick (unlike the host who has exposure 24/7). Babies can get mercury from their mother while in the womb and from breastmilk. But it's an interesting question whether someone with amalgams releases mercury into the air.