the trouble is jj even though its memory envoking you often cant place the memory of smell to where you orginally got it from - it more fragmented than other memory enducers such a sounds or sights.
I think JJ has the knack of matching smells with the time/place. I guess its like a gifted musician ytou can listed to a chord and say ,thats an E,B and G. Me, I just dont geddit!