Optical smoke alarms are your friends (if you wish to avoid being burnt alive) but can cause issues with vaping. Depends on the density/proximity of your vape.
Personally I don't vape where I wouldn't have previously smoked, at this stage it's all about convincing my brain that vaping is the same as puffing on the stinkies, and psychologically it's still working.
I happpily vape away on my walk to work outdoors tho, puffing copious vapour out of my drughole. Plenty of people on my route seem to do the same too, last week there was a young bloke with MPV, then me with my iStick, then an older woman vaping some sort of Ego stick with a large tank on it, all in a row.
I'm liking the prevelence and the diversity of users.
I have had a couple of incidents where people have coughed loudly after a hearty exhale on my behalf close to them, but these folk are most likely twots, and thus subject to the following considerations:
1) Do they cough like that at other times when subjected to the presence of water vapour, eg: near their kettle? I suspect not.
2) F*ck em.