Until recently I could have done that, but not now. Much improved by carefully not inhaling - (which is a good thing seeing the steroid preventer inhaler they gave me last week is giving me bad side effects similar to those I had after being ill - so I stopped using it on Sunday morning.)Double inhaling also helps, I've done it on short haul, this will be my 1st long haul and it's an A380 so might be more difficult, have to wait and see
In a recent article, it emerged that planes have detection in the toilets - for vapour! Not sure if it's all planes, or just some, but someone had set the alarm off on a flight.Or lock yourself in the Kahzi.
Let's hope all that changes before very long.