@KaBoom - I remember when people were getting zinc poisoning from denture cream. The whole thing was quite scandalous, if you ask me.
Also, I think the possibility of zinc poisoning is a good reason to check the ingredients on all of your vitamins. I have a good friend who loves to take vitamins and supplements. Which is fine, provided you're taking the right amount of stuff.
Anyway, one day I sat down with her and took a look at all the ingredients on her vitamins. It turned out that a lot of stuff she was taking individually (like zinc) was also in her multivitamin.
My friend actually was taking too much zinc, but we discovered it before she got zinc poisoning thank goodness!