I don’t notice this (I can’t believe someone out there has a symptom I don’t have!) I will mention that you can have migraine auras or “episodes” without headaches, and this could very well be what you’re experiencing. You know how our blood vessels seem to have forgotten what to do? Well if they constrict near the part of the brain interpreting smells, I could see how this could happen.
This article is a bit simplistic, but a great one for a quick run through:
http://on.msnbc.com/rXZSTW (why does every symptom we have want us to rule out BRAIN TUMOR?) 🙂 Diana