Dimensions of the drug experience derived from judgments by experienced drug users were combined to separate marihuana and psychedelic drugs into two classes. The marihuana substances were judged as calming as opposed to exciting, relatively safer, and less potent than psychedelic drugs. In this study and others it seems that marihuana may be more similar to sedative, depressant, and hypnotic drugs than to psychedelic drugs. Some superiority in correct classification was found for a non-linear discriminant function over a linear discriminant function.
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