I lost my sense of smell for about 6 months following a bad cold/ something flu-y. Initially I didn;t really notice - I wasn't enjoying food much, but it was when I was painting a room and realised I couldn't smell paint that I really noticed.

I remember when it came back. Someone made me a cup of tea (I'm British) and I rhapsodised for about 5 minutes about what an excellent cup of tea it was. Up until then, I couldn't really detect any difference between tea and coffee.