CAPSULES: Pot and Performance

It has long been recognized that drinking and driving do not mix, but many pot smokers believe that marijuana has little effect on their performance behind the wheel. They are dead wrong, according to Harry Klonoff, a professor of psychiatry at the University of Brit ish Columbia in Vancouver, B.C. Writ ing in Science, Klonoff describes how he and his associates tested 64 volunteers to determine how pot puffing affected their driving. The test subjects—all between the ages of 19 and 31—were well educated and were also experienced drivers. They were asked to drive through a complex course that...

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