Ever heard wine buffs prattle on about how their glass of vino smells of grass, hay, blackberries, leather, apple and other some such shite? And then they peer at you in a condescending manner when you mutter that it just smells like grapes or vinegar?
Finally we have conclusive scientific evidence that it is all bollocks and that people smell the world differently because of their genes. So it's got nothing to do with great expertise more so genetics, and the gene responsible has been identified as OR7D4.
So the only thing one can really smell when listening to a wine expert's opinion on the aromas of the wine is horse shit.