Subjective effects of khat chewing in humans.

The subjective effects of Khat (Catha edulis) chewing were studied in 14 male somali, habitual khat users, by means of the Addiction Research Center Inventory (ARCI) questionnaire and of visual analogue scales concerning mood and appetite. Results show that euphoria, improved intellectual efficiency and alertness were associated with khat consumption in 10 subjects. In contrast, the remaining 4 subjects experienced only dysphoria and mild sedation. These latter effects were present in all the subjects in the post-chewing period. In spite of these subjective differences, blood pressure and pulse rate increased in all the volunteers studied. As a whole, these results are consistent with the presumed amphetamine-like action of khat, but suggest also a major role of environmental factors in the expression of these actions.