I have found the holy grail of Stonerdom and it happens to be the Erowid website. The Erowid website catalogs and categorizes every single psychoactive hallucinogen known to man.
So, the next time you find your stash empty and experience an overwhelming urge to mow down on that wacky looking plant in your backyard in an attempt to get your buzz on, a quick glance at this site will let you know exactly what kind of a trip you are in for. It also lets you know if what you are about to ingest, sniff, or lick is legal or if it will garner you a possession charge.
Cataloging Recreational Drugs
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39 Disturbing and Revolutionary Drugs and Medical Innovations
19 Eyelash Innovations