The Washington Post and other sources reported that “drug use is down” because of the observed trend that the same proportion of 12 to 17 year-olds were using marijuana (around 7.1%).
But journalists and others who claim a leveling or decrease of the numbers appear to have read only the report’s headlines and high-level summaries. If they had read the data, they would have seen that from 2012 and 2013, when age groups were broken down further, a more accurate statement would be this: among 12 to 15 year-olds, marijuana use appears steady, but among 16 to 25 year-olds, marijuana use is going up.