SWIM says
Tramadol is the worst tasting followed quickly from Zolpidem, Zopiclone? "Starnoc" The metal taste it leaves is whicked. Then mushrooms (some better than others, the big red/orange ones grow in my backyard and I gotta cook them to eat them but I think that kills some of the active ingredients cause sometimes they work sometimes they don't which is different than eating the blue liberty caps. Oh ya and what we around here all Kerosene Coke, (the fuckers smuggle it in mixed with Kerosene and then evaporate it off I'm sure then again.... who knows...) I've also seen black cocaine which I was told was mixed with toner for photocopiers for importation purposes... How the hell they make it white again...
This from a person who enjoys Scotch, and can literally keep a couple hundred milligrams of codeine in his/her/it's mouth until dissolved.
Oh Vitamin B something smells so bad I can't get it in mouth to taste...but that's not really a mind altering substance...