norml22 - Page 25
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Major research studies on the effects of chronic marijuana
use have also been conducted in Jamaicas Greece, and Costa Rica--
three countries with a history of heavy marijuana use going back
hundreds of years. The Jamaican study, _a _i_ Jam__ica; A
Medic__l_Ant _ °ca Stu v o__f/hrg/lic__MazLi_na _$__ (1975), as
well as the other studies were discussed extensively in the HEW
Annual Reports. See S_ixt _gQr_t, at pgs. 20-21;
__if_th_Annua____2__Q___, at pgs 7-8. In all these studies,
cannabis users were carefully matched with non-users on such
variables as age, marital status, education, use of alcohol and
tobacco. The cannabis users smoked cannabis which is
substantially more potent that the marijuana commonly smoked in
the United States, and they smoked much more often than marijuana
is generally smoked in this county. Users in the three studies
had smoked cannabis for an average of seven to seventeen years.
The cannabis users and matched controls were subjected to an
extensive battery of physiological and psychological tests. No
significant differences were found between cannabis users and
non-users which could be directly attributed to cannabis use°
Associate professor of Public Policy at the John F. Kennedy
School of Government_ Harvard University, Mark A.R_ Kleiman
writes in his book _gain__t2/xce_ (1992} f _'the quarter century
since large numbers of Americans began to use marijuana has
produced remarkably little laboratory or epidemiological evidence
of serious health damage done by the drug0 '_ Id. at 253 (footnote
omitted).
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