What are some diseases....?

What are some diseases that can result from licking pennies. I've had a copper fettish forever. I even stick pennies in my beard to save them for later. Sometimes I use pennies in the bedroom as toys. But most of all I like licking them at Denny's. (The restuarant). So I was wondering is there any diseases you can get from licking pennies? I like the old brown ones the best.