1) Entheogens 
Ledol is a poisonous sesquiterpene that can cause cramps, paralysis, and delirium.{cn|date=June 2014} Caucasian peasants used Rhododendron plants for these effects in shamanic rituals with Steve Andrews in Herbs of the Northern Shaman: A Guide to Mind-Altering Plants of the Northern Hemisphere. ==Sources== Labrador tea contains ledol, an herbal te...