Dear Squinky,
Feel free to use anything I've said in this or my previous post if you decide to discuss this "smoky" issue with a doctor (or herbalist, or shaman or whomever else might be able to help you & all of us

I'd love to hear about someone out there who has not only heard of this issue, but might have answers or possibly even some proven treatments!
Although my husband is an M.D., he has never heard about this cigarette smell phenomenon in any of the medical literature he has read (except for the fact that it could be one of many olfactory auras said to precede a migraine).... but, DH is an ER doc--not an ENT, allergy or migraine specialist, so this is not a topic that he routinely studies.
I read your comment above and thought I might toss in a couple other ideas. At 48, I am nearing menopause, and I have found that I tend to get migraines more frequently. And, often just a few days prior to my periods I get a smoky smell, then a booming migraine. But, starting about 10 years ago -- at 38 -- I was also experiencing smoky smells. I was not yet peri-menopausal, but I was undergoing fertility treatments -- i.e. medically influenced hormonal floods -- that threw my normal hormone levels completely out of whack! (But, no regrets! The hormone overload did help me achieve pregnancy and I now have a healthy 8 year old to show for all of those crazy months.)
So, my hypothesis -- the idea that hormones could play a role in our smoky smell -- might explain why an earlier poster -- in her late teens to early 20s -- might be having this occurrence? She could be experiencing normal fluctuating hormones. Or, maybe she began or stopped using "the pill" which is just another kind of hormone therapy? Or, perhaps she increased or decreased the use of soy products in her diet (natural estrogens), etc.
But, this theory leaves me with no legitimate answer for why the men who have posted in this forum are having similar issues. I mean, they too have hormones, and those hormones can ebb and flow, but not usually so wildly as a woman's might. So?
Another thought.... does anyone have this smoky smell... and also smoke cigarettes? I mean, some smokers or former smokers like the smell of cigarettes.... so they may not find this "ghost odor" offensive? Maybe the smell of shell fish or perfume bothers a smoker -- so that is the offensive smell they perceive when we're smelling "smoke?"
Could our brains simply be "choosing" a smell that -- for some odd reason -- we find offensive? Has anyone searched for other offensive "phantom" odors? Hmm. Maybe other folks are complaining of phantom citrus or ghostly mothballs smells? Maybe what we're experiencing is just a "muscle twinge?" We've all had muscle spasms or charley horses for what seems to be no apparent reason.... maybe this is just an odd olfactory flinch?
In our house, we also face mold issues, pet dander and countless outside allergens... so while my DH & DS sneeze and take antihistamines, perhaps I react to these allergies by smelling smoke? I don't know. Just wondering. I'd love for someone to bring these issues up to curious medical professionals. I truly believe there's something going on here that traditional medicine has not picked up on yet. Hey, it was only a handful of years ago that most medical professionals did not believe that fibromyalgia was a REAL condition... yet today, everywhere you look there are clinics, medicines, herbs, etc. offered in the treatment of fibromyalgia, so, maybe we are all just ahead of the curve?
Anyway... Keep posting everyone!! I do indeed feel less of a pariah just knowing that I can vent with y'all!
Cheers, IndyLemon