"Smellucinations" were the very first type I ever had, way back when I was like 14 or 15. I would smell things that were not there, usually a particular type of soap that would for some reason bring all these half-formed memories to mind with it. As I got older I noticed my sense of smell was extraordinarily keen. You can ask my son, one time he came home from playing at a friend's house and I kept sniffing the air and saying, "what were you DOING over there?" Then I'm like, wait, don't tell me -- you were playing with electric trains! Because I could SMELL them. I can smell the precise change in the air when a season actually changes (when the weather pattern shifts), I can smell rain and snow (easy, many can), I can occasionally smell human emotions and even the presence of 'invisibles' (spirits, entities, whatever) (if you accept such things as really existing -- if not just ignore that part, i'm not here to argue it) ... it's uncanny. i have smoked off & on all my life but it hasn't diminished this capacity at all.