I'm watching an old movie. On the tv it's night and there's diesel motor running and instantly I smell diesel fumes. 40 years ago I worked in the oilfields and often worked the night-shift loading and unloading oil pipe to be transported to cargo boats. The smell of diesel exhaust has remained in my memory all this time. And now I smell it as I watch this old movie.
Loss of smell is one of the symptoms of PD. What about the opposite? That is, smelling things that aren't real? I've had this symptom for 20+ years. Long before I was diagnosed with PD.
Losing the sense of smell occurs in the brain. For me it's called olfactory hallucination. But losing takes time. And before it's gone the brain might latch onto other memories of odors? Sort of says the brain is trying to make sense of what's going on?