The new results echo a study showing a decline in teen use after sales of recreational pot began in 2014 in Washington state.
The results"should help to quell some concerns that use among teens will actually go up. This is an important piece when weighing the costs and benefits of legalization," Anderson said.
About 20 percent of U.S. high school students use marijuana, unchanged since 2015 after an earlier decline, according to the 2017 version of the surveys used in the study. Rates ranged from 13 percent of 9th graders to 26 percent of high school seniors, according to the survey data from the federal Centers for Disease Control and Prevention.," authors of the new study wrote. In the short-term, it can cause impaired memory and attention problems lasting weeks.
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