Did you know that marijuana use among U.S. teens has dropped dramatically since the late 1990s? So...if you were thinking everyone smokes pot, they don't. Statistics show that about 15 percent, or roughly 1 in 7 teens, report past-month marijuana use. In the last few years, however, the decline in marijuana use has stalled, and the reason may be that fewer of you consider marijuana to be a harmful drug. BUT...that perception is not correct. In 2009, among marijuana users 12 and older, 4.3 million had a marijuana abuse or addiction problem, according to clinical diagnostic criteria. Look inside this booklet to see what else we know, because marijuana is not as harmless as you may think.