Airlines would be in a very tenuous position indeed if they started issuing drugs to people for whatever reason at all. Ever tried to get an aspirin on board?
I agree that refraining from smoking in-flight may well be an issue in some "air rage" cases.
However, I do not consider it an excuse for the sort of behaviour that we have been hearing about far too often.
Furthermore, (and I speak as a smoker myself) since everyone knows that the vast majority of airlines now an smoking, I would not have thought it was beyond the wit even of people like these to plan ahead and arm themselves with patches, gum, inhalers - whatever works for them.
Sorry - no sympathy with smoking as a "cause".