Most teens report using marijuana less often after legalization: Only one group of teenagers used marijuana more often after retail sales were legalized in Washington than they did before – high school seniors who work 11 or more hours per week, according to new research from Washington State.

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Most teens report using marijuana less often after legalization: Only one group of teenagers used marijuana more often after retail sales were legalized in Washington than they did before – high school seniors who work 11 or more hours per week, according to new research from Washington State.