I have always been able to smell the musky scent of parkinsons on myself.Before i was diagnosed back in November 2009,i thought it was an odour of cancer.At the time,some of the symptoms i was getting were pointing in that direction.
Having known a couple of people who had cancer,i was aware of the sickly,similar(but worse)scent on them.I assumed at the time,that everybody was aware of this smell.But obviously not.
The parkinsons smell is a variation on this.I can smell it on myself,also this varies in strength.In the same way,i can go shopping and smell the"cancer smell"on a person passing by,and particularly strong if that person is"for example" sat on a bus.
To me,it seems as natural a thing to detect,as the strong smell of of somebody who has not bathed for a while,an unwashed unclean smell which can come hand in hand with BO.
I tried telling my doctor and Neuro about this"being able to smell parkinsons" years ago.They were very dismissive,as usual.
Anyway,there are my thoughts.