Last year I got started smoking with the Red Brinkmann electric. I always just used the wood chips in a cast iron smoker box because they were easy to find. Those things just burn out way too fast no matter what I do with them. This time around I want to try wood chunks. How do I have to treat those differently? Should I just set them straight on the lava rocks? Or put them in the smoker box with the lid off maybe? How many of those bigger chunks should I put in there for a smoke of a 6 pound butt?