I think you have to deal with the attack and the "irrational" fear of the smoke rather than just the smoke alone since they're connected. The more you try to avoid it the stronger it becomes. Sounds like you're afraid of being afraid (as my T put it). You have to deal with the attack which is over and not likely to happen again, all your feelings and fears and pain that happened with that and/or be around smoke and de-couple it from the reality of the moment since "smoking" and "being attacked" are not really related.

I'm so sorry you have this complicated, painful problem!