I don't stealth-vape at my desk at work, but I also don't flaunt it. My PVs are sitting openly on my desk. My boss follows my Facebook, so he can see that I quit smoking... but he also hasn't said a word when I go outside to take a vaping break instead of a smoking break (hey, that was a sanity measure to keep me from going nutty from working a desk job), nor has he said anything to me about vaping... but I'm also not the only one who vapes at my work.
I do tend to be slightly more stealthy about vaping during bright daylight hours elsewhere than at night (I'm wide open about it at night, probably because by that point, I'm tired enough to not care anymore). However, I recently did the whole 24-hours-at-Disneyland leap-day thing, and was anything BUT stealthy while vaping all over the park, and to be honest, nobody really noticed.
If you're worried about blowing out a plume of vapor where someone will object, just hold it in for a couple-few extra seconds (for me, it's about 7 seconds), and voila, no vapor emerges when you exhale.