I have a old pound apple tree out back the lost a big limb who knows how long ago. I cut some chunks off of it tonight. All bark is gone. So I fired up the mini for a test run. Hard to catch the smoke out of the vent. This is with 2 chunks burning. The inside. The wood seemed to last longer than store bought and smelled great. The wood is a little soft. Think it is good to use? If so I have enough for a very long time.