i stealth vape out and about. Lowe's, Home Depot, at the mall, sitting at a nice comfy sofa at Sear's while my wife does her looking around, at the shoe store . . . . anyhow, i think if done discreetly, no one is the wiser and no complains. If i plume, im sure that someone will say something. Most of all, i like the fact that i can get my nicotine hit and be happy and those around me don't have to smell it and therefore, be happy or miserable or whatever they are without me influencing them.
Technically, we do not know enough about the effects of residual (2nd hand) vapor... though i would hazard to guess that it dissipates too quickly and effects are negligible at best (at worst) - don't have a ph.d. to shove so far up my .... to make this guess ... and so i even vape at work if my boss isnt' around as my co-worker immediately to my right does not mind.
However, i only take hits now and then and do not chain vape as i want nothing to linger in the air.
A bad effect from vaping is that im more sedantary than ever ... no more walking to the back patio, outside, whatever to go take a smoke. Still take a walk on occassion when i feel i need to vape a bit, but much less often than when i was smoking.
Being polite and discreet keeps off the heat.
(oh no, that rhymed)

Happy Vaping / Be Healthy / Happy Holidays.