consists of the THC-rich resinous material of the cannabis plant, which
is collected, dried, and then compressed into a variety of forms, such
as balls, cakes, or cookie-like sheets. Pieces are then broken off,
placed in pipes, and smoked. The Middle East, North Africa, Pakistan,
and Afghanistan are the main sources of hashish. The THC content of
hashish that reached the United States, where demand is limited,
averaged about 5 percent in the 1990s.
hash oil is used by illicit drug users and dealers, but is a misnomer in
suggesting any resemblance to hashish. Hash oil is produced by
extracting the cannabinoids from plant material with a solvent. The
color and odor of the resulting extract will vary, depending on the type
of solvent used. Current samples of hash oil, a viscous liquid ranging
from amber to dark brown in color, average about 15 percent THC. In
terms of its psychoactive effect, a drop or two of this liquid on a
cigarette is equal to a single "joint" of marijuana.