Abstract
This paper is concerned with the psychiatric evaluation of 81 volunteers in a marihuana project.
The psychiatric status has been evaluated in a standard manner and the drug history, both prescribed and non-prescribed, has been determined.
A method of classification of the non-adverse and adverse drug effects is suggested. Observations are made with respect to the subjective responses of the volunteers in regard to their drug intake, and these are compared to the hard data obtained in the neurophysiological and neuropsychological parts of the study and from fifteen key papers reviewed. The serious lack of precise methodological design and the need for more accurate information with respect to placebo effects, suggestibility and the social set in the area of marihuana use are noted.