ABSTRACT
Cannabis is one of the oldest cultivated nonfood plants, and does not seem to exist anymore in a wild form. It has been used not only for psychoactive effects, but also for its fibers. Hemp fibers have been found in China dating from 4000 B.C., and hemp ropes dating from 3000 B.C. were found in Turkistan. However, it is uncertain whether cannabis was used for psychoactive purposes at those places and times. This may seem ironic, but consider that there are psychoactive plants all around us and most of us are unaware of them.
