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Cyanide is one of the best known of all poisons. Perhaps best known as the suicide pills reputedly carried by secret agents it was also the active ingredient in the gas (Zyklon B) used by the Nazis in extermination camps such as Auschwitz.
There is, however, a sumac that should be avoided at all costs: Toxicodendron vernix, better known as poison sumac. Poison sumac is one of a trio of plants (poison ivy, poison sumac, and poison oak) that produce an oil called urushiol, which is a potent allergen.