I've been seeing trails since the first time I did acid, 14 years ago. Still there, though I hardly notice it anymore. Just one of those things, I guess
The odours occasionally wafted from the laboratory were exceedingly strange. Sometimes they were noxious, but more often they were aromatic, with a haunting, elusive quality which seemed to have the power of inducing fantastic images.
People who smelled them had a tendency to glimpse momentary mirages of enormous vistas, with strange hills or endless avenues of sphinxes and hippogriffs stretching off into infinite distance.
- H.P. Lovecraft