Olfactory (smell) Hallucinations, anyone else?

[tayo]

Alright so swim has done alot of psychedelics, mostly mushrooms, hasn't for a good 6 months but now swim seems to have little hallucinations of smelling things that clearly aren't there, at least 5 times a day. The smell triggers an association of the food or liquor or anything that the smell might be, now is it possible that the thought is somehow coming first and triggering the smell? ... and of course, can this be cause by psychedelic use? is this some rare form of HPPD (Hallucinogen Persisting Perception Disorder)? anyone else?