One stat among many from the report:
Hallucinogens are another fairly widely used class of substances. Lifetime prevalence of use is 3.3% for 8th graders, 6.0% for 10th graders, and 8.3% for 12th graders. Until 2001, hallucinogen prevalence rates ranked this high primarily due to the prevalence of LSD use. In 2011, larger proportions of students—2.8%, 5.2%, and 7.3%, respectively, for the three grade levels—indicate using hallucinogens other than LSD (particularly “shrooms” or psylocibin) compared to 1.7%, 2.8%, and 4.0% for LSD.
http://www.monitoringthefuture.org/pubs ... 1_2011.pdf