I live in a college dorm and the last thing I want to do while vaping is set off the fire alarm.
Does that urge just die after high school these days?
I think gpc2012 is fairly correct here. There's different kinds of detectors, some may be sensitive to vapor and others may not. I've seen some set off by the steam from a hot shower, which seems completely ridiculous to me. Given that, I think it's entirely possible *some* types of detectors could inadvertently trigger a false alarm.
If it were me, I'd test the theory. Figure out some way to generate some steam...a hot towel, boil some water, whatever...this is your alibi. Then, cloud vape that detector a few times. If it sets off, you can tell whomever responds that you were just hot towling your head or whatever matches your alibi. Likely, they won't be able to tell what from what and won't be able to prove anything...but obviously, nothing will be on fire.