I use a WSM, chevelle. It was leaking a little smoke around the side door (which I guess is common when they start aging) my last smoke. I had the vents closed and the top vent most of the way closed and it was still running a bit hot. I need to find a hi-temp gasket regardless to fix the problem, but I will use less lit fuel, too. I need to get down to 160F.
And if it turns out, I'll tell you what kind it is.
If it doesn't, it will be kept a well guarded secret