smokedog I have had great results using smoke tubes filled with wood pellets. All kinds of wood you can use. They last ( depending on the one you use) about 4hours. I place a small piece of foil under it to catch the few ashes.

I had an electric smoker do it twice. I was using Whiskey barrel chipps both times. I figured gas build up from the wood chips.

Phantom , I bought a Pit Boss Platinum Brunswick pellet smoker this January so far I am loving it. Doing boston butts today. Pellets are really dry and don’t think that will happen again. Wood chips and saw dust do put off a gas. It was popular during WWII to heat wood and run trucks off the gases.

The problem may be they have too much moisture in them. Dry wood doesn’t give off as much gasses or smoke.