As an addenum, don't use the bottom of your smoker as a grill to boil the skull either.
At least not without constant supervision.
Had to take a crash course in Deck Repair 101 when I left it on the back deck boiling while I ran to Wally world and some embers escaped the tiny hole at the bottom of the smoker and started the deck smoldering. Luckily the hole burned through rather unevenly and the whole thing shifted sending water out of the pot onto the deck.
Put itself out thank God or I may not have had a deck/house to come home to when I returned.