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The effects of cannabis and alcohol on simulated car driving were studied. Cannabis resin containing 4 percent Delta(1)-tetrahydrocannabinol was administered orally in three doses equivalent to 8, 12, and 16 milligrams of that component. Alcohol was given orally in one standard dose of 70 grams. Both cannabis and alcohol increased the time required to brake and start, whereas alcohol increased while cannabis decreased the number of gear changes. An effect of dosage on response was observed with cannabis.
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Rafaelsen et al. (1973) studied this question.
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