I'm looking for some advise. I have a homemade propane smoker/grill (I know, a lot of people don't like the propane route but...) and I can get a lot of smoke out of my smoker box until I turn up the heat in the main grilling area. As soon as I turn on a burner to bring up the temp, the smoke does nothing. What am I missing? Evidently the heat is not allowing or drawing the smoke into the main barrel. Any suggestions? I have another one similar with a longer chimney on the smoker but have the same problem.