When I had my triplets, I pretty much lost my sense of smell. I don't know what the cause was-crazy hormones, or the fact that I fainted one day and hit my head pretty hard. The only blessing is that I could handle the diaper days pretty easily.
Even though my sense of smell isn't great, I still have a memory of smells and will occasionally "smell" these. For example, when I was pregnant with my first child, I absolutely hated the smell of a local grocery store. I can still remember that smell and get a disgusted feeling from it.
I guess I won't get too many olfactory hallucinations, but it is weird that I can smell certain events through memories.
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