Abstract
Ten young, healthy male volunteers smoked a marihuana cigarette with 2.5% δ 9-THC and a THC-exhausted placebo cigarette. The marihuana administration was associated with an increase in heart rate, elevation of systolic blood pressure, conjunctival reddening and specific airway conductance increase; time perception and Automated Digit Symbol Substitution Test performance were impaired. Diastolic blood pressure and attention measured by the Continuous Performance Task were not affected.
The placebo preparation produced a subjective pleasant “high” but no physiologic effects nor performance change. The “high” induced by the active preparation was often rated as unpleasant.
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This work was supported by NIMH award number 5 R01 DA00067-03.