The National Commission on Marihuana and Drug Abuse
Marihuana - A Signal of Misunderstanding.
Chapter II
marihuana use and its effects
VERY LONG-TERM EFFECTS OF HEAVY AND VERY HEAVY USE
Knowledge of the effects of very heavy, very long-term use of marihuana by
man is still incomplete. The Commission has extensively reviewed the world
literature as well as ongoing studies in Jamaica and Greece, and carefully
observed very heavy, very long-term using populations in countries in other
parts of the world, such as Afghanistan and India. These populations smoke and
often drink much stronger drug preparations, hashish and ganja, than are
commonly used in America. From these investigations, some observable
consequences are becoming much clearer.
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