Every flight attendant is different and every flight is different, its a risk either way, im sure anyone could survive the trip, you have probably did it when you were a smoker and didnt dare spark a cig up on the plane because you were "dying for one", vape in the airport before your flight. I was told at my airport where I work in winnipeg my co workers seen tons of people vaping in pre-boarding or walking through the arrivals.
and in case if no one has see
This, think about how stealthy is your vaping is