File under “they needed a study for this?” – Marijuana raises the risk of car crashes: “In a population-based, case-controlled study of more than 9,000 drivers with known drug and alcohol blood concentrations, he and colleagues found a positive test for cannabis to be associated with a three times greater risk of being responsible for a fatal road crash (odds ratio 3.32, 95% confidence interval 2.63 to 4.18).”

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