I smoked some cheese on mine a couple of years ago.
I used only 2-3 unlit briquettes, 1 chunk of wood and 1 lit briquette to keep the temps below 100. It was a hot summer day and even with that I was able to keep the temps down significantly.
I think it all just depends on how much coals you're burning at one time.
18.5", 22.5" OTS
Large BGE (chambersuac's)
The Fiery Furnace (chambersuac's)
Big JT's Smokin' BBQ Competition Team