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Clinical studies have given contradictory reports on the effect of smoking marijuana on the plasma levels of testosterone in males. A reanalysis of existing data established that testosterone levels are depressed both after smoking one marijuana cigarette and after intravenous infusion of delta-9-tetrahydrocannabinol, a pharmacologically active component of marijuana. Simulation of the marijuana interaction, under the assumption that delta-9-tetrahydrocannabinol inhibits testosterone production or secretion, suggests a minimum of 24 hours are required for testosterone to return to pre-smoking levels. A series of clinical studies are specified to clarify the nature of the interaction.
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