[Cannabis].

Cannabis produces a resin, the psychotropic effects of which are known since the High Antiquity. It induces euphoria, a feeling of pleasant dreaminess. Nevertheless, psychiatric disturbances such as psychomotor deficiency states or acute oniroïd states were described in heavy users countries. These psychiatric disorders put the accent on the starting or catalysing role of cannabis on the premorbid personality. The experimental studies of cannabis on the premorbid personality. The experimental studies of cannabis and its active substance (delta-g-tetrahydrocanabinol) bring information on this problem.