Got away with it everywhere. Plane, supermarket, bars, clubs, plane, college, and so on.
I take my freedom of blowing out water vapour pretty seriously. The only time I had a problem was at a club here in Montreal. The dumb ... bouncer told me that I was "promoting" indoor smoking, and that if I didn't stop I'd have to leave. I told his that if he kicked me out the club would receive a call from lawyers the next day. When he saw I was serious, he left me alone.