Less Than 10 Percent Of US Adults Use Marijuana In A Past Year

From The National Institute of Health, "Prevalence of Marijuana Use Among U.S. Adults Doubles Over Past Decade: Surveys show 9.5 percent of Americans use marijuana; 30 percent of users meet criteria for a disorder:"

The percentage of Americans who reported using marijuana in the past year more than doubled between 2001-2002 and 2012-2013, and the increase in marijuana use disorder during that time was nearly as large. Past year marijuana use rose from 4.1 percent to 9.5 percent of the U.S. adult population, while the prevalence of marijuana use disorder rose from 1.5 percent to 2.9 percent, according to national surveys conducted by the National Institute on Alcohol Abuse and Alcoholism (NIAAA), part of the National Institutes of Health.***The marked increase in marijuana use and marijuana use disorder shown in the study is a significant change from prior results. Earlier NIAAA research found that marijuana use remained stable at about 4 percent of the U.S. population between 1991-1992 and 2001-2002, while abuse and dependence rose from 1.2 percent to 1.5 percent.