How Many Teens Use Marijuana?

Marijuana use declined from the late 1990s through 2007, with a decrease in past-year use of more than 20 percent in all three grades combined from 2000 to 2007. Unfortunately, this trend appears to be reversing. Since 2006, annual, monthly, and daily marijuana use increased among 10th and 12th graders. In 2011, 6.6 percent of 12th graders reported using marijuana daily, compared to 5.0 percent in 2006.