I was looking on eBay for a cigarette holder, cuz I want to dress up as Hunter S. Thompson for Halloween. One of the auctions had a holder that looks like one he would have used, but it also had this: What's that pipe at the back? It looks like it has a smoke chamber. Am I supposed to put a joint in there, and the smoke would gather in that chamber there? Has anyone used a pipe like this? Should I try and get it?