Illicit drug use peaked in the 1970s, decreased steadily until the early 1990s, and then increased during the 1990s, with a slight decline and leveling off at the close of the decade. Marijuana is the most common illicit drug used. In 2000, more than half (54%) of American high school seniors reported using some type of illicit drug in their lifetimes. Reported prevalence rates among tenth and eighth grade students that year were lower (46% and 27%, respectively). In 2000, one-quarter of twelfth grade students reported using an illicit drug during the previous month, followed by 23 percent of tenth graders and 12 percent of eighth grade students.
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