"During the 1990s, the annual prevalence of marijuana use tripled among 8th graders (from 6% in 1991 to 18% in 1996), more than doubled among 10th graders (from 15% in 1992 to 35% in 1997), and nearly doubled among 12th graders (from 22% in 1992 to 39% in 1997). Among college students, however, the increase in marijuana use was much more gradual, presumably due to a generational replacement effect. Annual prevalence of use rose by about one third, from 27% in 1991 to 36% in 1998.
Monitoring The Future
" The vast majority of 12th graders disapprove of regular use of any of the illicit drugs (see Table 8-6). Among 2016 12th graders, 69% disapprove (including strongly disapprove) of regular marijuana use and between 92% and 96% disapprove of regular use of each of the other illicit drugs. (Regular steroid use meets with an 87% disapproval rate.)
Data Table of Estimated 30-Day Prevalence of Use of Various Drugs for Young People in the US in Grades 8, 10, and 12 Combined, 1998 through 2016, According to the Monitoring The Future Survey
"Crack cocaine use spread rapidly from the early to mid-1980s. Still, among 12th graders, the use of crack remained relatively low during this period (3.9% annual prevalence in 1987). Clearly, crack had quickly attained a reputation as a dangerous drug, and by the time of our first measurement of perceived risk in 1987, it was seen as the most dangerous of all drugs. Annual prevalence dropped sharply in the next few years, reaching 1.5% by 1991, where it remained through 1993.