Keith, I have had this problem for several years. I suppose it was a sympton of my PD long before I had an inkling of any real problem! I would get the odor of something (like a wet dog!) and it would hang around for a long time and then it would be something else! I couldn't explain it to anyone as they thought it was my imagination! After I knew about my PD I talked to a few others who had had the same problem. I have never mentioned it to my neuro as I suspect most people haven't. It seems a minor problem in the face of all other strange and terrible things we put up with! Who knows,what next? Ruth 67/9