Could be you're the first person to catch me sneaking cigarettes...can you smell them out there in cyberspace?
Actually, though, I have had olfactory hallucinations when on a couple of different meds. Usually, it was worst right when I started and when I switched off to something new. I always figured it was a side-effect akin to getting a bad taste in your mouth like I do from some antibiotics. I suggest telling your t or doc just to get some input. I don't think they would react badly or anything and they might be able to figure it out with you. I know it's super annoying, but I always considered it much milder and easier to deal with than auditory (or visual) hallucinations. When I'd complain about smelling something that wasn't there, my dh would laugh and say "there goes your amnosia (his little made up name for it)."