A new study from Columbia University found that marijuana contributed to 12 percent of traffic fatalities in 2010, triple the percentage from a decade earlier. That means pot is a factor in almost one in eight deaths on the road. Research by the National Highway Traffic Safety Administration found 4 percent of drivers are high during the day and more than 6 percent are high at night. Potentially exacerbating the problem is the fact that younger drivers are more likely to be high: One in eight high-school seniors say they drive after smoking marijuana.
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