It's some sort of chemically enginered polymer glue, so it sticks but is detachable. I wouldn't wana smoke it.
I actually smoked from a dollar bill once. HORRIBLE idea, cancer cough for 3 days and my lungs felt like they were raped.
heh I'm gonna try it tonight, i know this kid who's a crazy fuck, he'll do anything... I'll get him to try it, and I'll report back.