The Youth Risk Behavior Surveillance System (YRBS) produced by the Centers for Disease Control is one of the nation's longest-running and most extensive efforts to monitor health-risk behaviors contributing to the leading causes of death for children and young adults. Drug use — specifically, marijuana use — is tracked. In the CDC's latest report, issued late last week, the two states that have legalized marijuana for recreational use — Colorado and Washington — are not represented. And still other states — such as California, where adolescent marijuana use is pronounced, and Oregon, which is currently considering the legalization of marijuana for recreational use — didn't fully participate in the study, if at all.
Further reading    More international news