Re: Juice in the base or...
I have tried it with only alcohol in the base (with some ice of course) and the smoke has a weird taste. I tried it, on seperate occasions, with vodka, wine, soco, and heaven (a concoction involving schnapps the recipe of which shall remain a secret). Mostly it either causes some hardcore dizzyness (especially with the vodka), or the buzz becomes more pronounced not unlike actually drinking.
Try it if you want, but the experience is different for each liquid of choice.
My favorites are still juice and ice water.