There is a lot of mind games we play with ourselves. Whether it makes a difference, who the heck knows. I stack a couple of my chunks. I also do what I've described as a phased or stage burn where I start with a little sawdust or pellets and work my way up in sizes so that when the little stuff is just burning out, the next size is starting. Again, a mental game I use to believe I'm getting better smoke. LOL!