Re: Ex-smoker, vaper here
I'm vaping at work, and even in aeroplanes, without any complaints whatsoever! No colleagues ever complained, and no smoke alarms have been set off. Actually, on the point of smoke alarms, it's weird that they would go off, as it would mean you can't boil a kettle under one of them either: also steam, just like what I exhale!
I vape for the nicotine, not to generate any clouds... With decent kit, it gives enough of a throat hit to satisfy me, and I need the nicotine (yes, I'm addicted to it, and so what, that's my choice!)