That is a fascinating condition.  Many years ago, I was a wine lecturer at Westminster College, and I remember having a conversation about olfactory stimulation as we age. In the world of wine we have to keep smelling everything to keep those scent memories fresh.  The fact that you can pick it up on the fruit and not in the snuff is very puzzling, and the only suggestion I have is to mention it to your Doctor.  Sorry not to be more helpful.