I am so glad I found this forum. I just got a smoker about a month ago. It's a charbroil 40" with a good size hot box. I tried smoking a few things already. I recently tried smoking a 4 lb pork butt. The biggest problem I have run into so far is maintaining temperature. What happened is, my temperature would fall, then I would add coal. The temperature would go up a bit but I could never get it back to where it was when I started. At the end of 6 hours My hot box was full of used coal but my temp stayed low. I had to finish my pork in the oven Any tips would help Thanks guys.