I've seen that. It is incongruent in my opinion, but so long as it doesn't interfere with an instructor's ability to do what they do, it isn't a problem for me. So long as what they're smoking isn't some kind of illegal drug, it shouldn't make a difference.I try not to comment on this type of thing either. But a lot of people do take offense at their teacher's personal habits. Their teacher smoking seems to be a big one for martial artists. People can get really judgmental over that issue.
Daniel