I am so happy my sister just sent me this link. For the past few years I have been suffering from this somewhat weird and annoying condition and until now I didn't know anyone else was either. It's sure good to hear I am not alone, although it is a little scarey to read that one of the causes could be little brain seizures. A few years ago my GP sent me to an ENT specialist but upon a quick physical exam, he said everything looked normal to him and gave me a prescription which I never filled. I personally got the feeling he thought I was a mental case! My thought was if you don't know exactly what is causing the problem, and everything looked normal, what's with the prescription! So I just kept on 'suffering'.
Like a few of you also reported, I am a migraine and headache sufferer and have been for years, so this might appear to me to be a probable cause. Coincidentally, I have a doctor's appointment today and I will definitely bring this up with him again. Another sister also sent me another link on the possibility of this condition being related to migraines.
http://headaches.about.com/od/asktheclinic
ia1/f/120704_10f.htm
I will surely report back if I return home with any kind of diagnosis or treatment for this annoying problem.
UPDATE: (Feb. 9/0
I mentioned to my GP that I had come across this forum, as well as having found an article on another website about a possible correlation between migraines and smelling smoke. He said there could be a possibility that this could be some sort of olfactory aura, but he believes that the smoke smell could be also be caused by nerve damage in the sinuses, saying even a cold virus could even be responsible for the damage. Unfortunately he couldn't offer anything else as so far there doesn't seem to be any other information about this condition available, be it cause or treatment. He also has 4 other patients who have reported this problem, so along with them and those of you who have written, I am at least relieved to know I am not alone and the problem is in my sinuses and not my mind!