Originally Posted by ttdr
No i'm not talking about bbqu coals the warning above is enough for me to not try that A).
It depends on what kind of coal you're using. If it's all natural charcoal with nothing added (quicklight charcoal) then you'll be fine. It's no different from bulk lump charcoal used for hookahs.
But like others have said, you will have alot of ash and they won't last very long.