Re: has anyone ever tried or heard of this?
Waste of time.
As I've said many times before, Hookah smoking is the pinnacle of a half a millennium old. It is developed, refined, and designed to perfection. If smoking straight glycerin was a great idea, we'd all be smoking glycerin right now. We're not. If you want to find out why, go ahead and smoke some straight glycerin. Don't say I didn't warn ya.
Darth Coyote, Executor of EGOB and the Black Leaf Brotherhood.