[Mr. Dispenser]

Just as Nostradamus used ceremonial magic to probe the future, so Alhazred used similar techniques (and an incense composed of olibanum, storax, dictamnus, opium and hashish) to clarify the past, and it is this, combined with a lack of references, which has resulted in the Necronomicon being dismissed as largely worthless by historians.

from http://www.digital-brilliance.com/necron/necron.htm -=PEZ