In 2016, rates of marijuana use among the nation's 12- to 17-year-olds dropped to their lowest level in more than two decades, according to federal survey data released this week.
Last year, 6.5 percent of adolescents used marijuana on a monthly basis, according to the latest National Survey on Drug Use and Health. That represents a statistically significant drop from 2014, when the nation's first recreational marijuana shops opened in Washington state and Colorado.
