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Hallucinogenic Effects of Marijuana as Currently Used
MARTIN H. KEELER; JOHN A. EWING; BEATRICE A. ROUSE
Am J Psychiatry 1971;128:213-216.
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Professor of Psychiatry, Medical University of South Carolina, 80 Barre St., Charleston, S.C. 29401

Professor of Psychiatry, Department of Psychiatry, University of North Carolina School of Medicine, Chapel Hill, N.C.

Research Associate, Department of Psychiatry, University of North Carolina School of Medicine, Chapel Hill, N.C.

1972, American Psychiatric Association

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Abstract

A questionnaire study of 42 randomly selected young men who used marijuana revealed that about 90 percent had experienced minor changes in perception (seeing colors or objects as more intense); about half had experienced major perceptual changes (hallucinating colors or designs); and about 40 percent had experienced hallucinogenic ideation. The authors conclude that marijuana, as used by the population studied, is a hallucinogen. They caution, however, that this is not evidence that the drug is either harmful or harmless.

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