I tried this today with a bowl of Dunhill flake. I loaded up an entire large flake and smoked beautifully for about an hour. I decided to put it down for a bit and ran a pipe cleaner through the stem and shank and returned a few hours later. The bowl would simply not light. I emptied and repacked and after a few minutes ended up dumping the rest. I smoked a bowl of grusemore plug earlier and let a small amount sit for a couple hours before returning to it only to have the same results. For people that dgt a bowl do you dry the flake a lot before smoking?