Not to be overly crude, but so does my ass after I eat to much mexican food. So do my burps, after shotgunning a bunch of vodka-redbulls. As for visual byproduct.. would it be better if it were invisible? My behavior after too many vodka-redbulls is far more of a public nuisance, yet they still let me drink those indoors (actually, I am not allow to drink them outdoors. Weird.)

Anyway, I have a few friends who use e-cigs. Can't say I notice it. My hypothesis here is that people primarily get bent out of shape over e-cigs because they feel that the users are "cheating", and nobody likes a cheater. That or they forget what somebody actually smoking is like.