Marijuana is a mixture of leaves and the flowering tops of the Indian hemp
             plant Cannabis Sativa, smoked or eaten for its hallucinogenic and
             pleasure-giving effects. The psychoactive ingredient of marijuana,
             tetrahydrocannabinol (THC), is concentrated in the flowering tops of the
             hemp plant; hashish, a drug prepared from the plant resin, has about eight
             times more THC than marijuana. Hemp grows throughout temperate regions,
             with the more potent varieties produced in dry, hot, upland climates. Expect
             for limited medical purposes, cultivating hemp for marijuana is illegal in all
             Marijuana has a lot of slang names including pot, grass, weed, hash,
             and about 200 other names. Marijuana is by far the world's most commonly
             used illicit drug and far more dangerous than most users realize. So, there is
             just cause for alarm when adolescent marijuana use increases, as it did in the
             mid-1990's, and the age at which youngsters first experiment with pot starts
             Many users describe two phases of marijuana intoxication: initial
             stimulation, giddiness, and euphoria, followed by sedation and tranquillity.
             Mood changes are often accompanied by altered perceptions of time and
             space and of one's bodily dimensions. The thinking processes become
             disrupted by fragmentary ideas and memories. Many users report increased
             appetite, heightened sensory awareness, and pleasure. Negative effects can
             include confusion, acute panic reactions, anxiety attacks, fear, a sense of
             helplessness, and loss of self-control.
             Like alcohol intoxication, marijuana intoxication impairs reading,
             comprehension, memory, speech, problem solving ability, and reaction time.
             The effects on the intellect of long-term use are unknown. Consistent
             evidence that marijuana induces or causes brain damage does not exist.
             Medical research has indicated that the drug is effective in relieving some of
             the sym...