At random, I have been smelling cigarette smoke as well as other odors; burning plastic, musty, and an odor that I have been unable to identify but it is acrid..very sharp and chemical. Also, there is at times a very horrible 'aftertaste' which persists for days.
This has been going on for a little over 3 years now. My doc blames it on 'diabetic neuropathy', which makes these odors and tastes hallucinatory.
IMO, IF THESE THINGS WERE HALLUCINATIONS, THEY WOULD NOT GO AWAY WHEN THERE IS A BREEZE BLOWING!
But my doc does not take that into account.
My phantom odors disappear when I open the car windows or go outside.
An indication, I think, that these things are real.