The recently published Centers for Disease Control and Prevention (CDC) survey offers a compelling look at the trends in marijuana use among high school students over the past decade. As states across the nation have moved to legalize cannabis, this data provides crucial insights into the actual impact of these policy changes on youth consumption. One of the most striking findings from the report is the overall decline in past-month marijuana use among high school students. In 2013, 23% of surveyed students reported using marijuana within the past month.