Since the late 1990s, self-reported annual marijuana use by 12th graders has fallen an estimated 25 percent. Among 10th graders, it has fallen by 50 percent. Among 8th graders, it has fallen by more than half.
The post Federally Funded Survey: Marijuana Use …

Federally funded survey data provided by the University of Michigan reports that rates of teen marijuana use remain near historic lows.
Consistent with data provided last month by the Substance Abus…