Monitoring the Future released 2012 data from in-school surveys of 8th, 10th, and 12th grade students regarding Tobacco, Alcohol and Other Drug trends in the US.  For more information, please go to https://www.monitoringthefuture.org/data/12data.html#2012data-drugs.   A summary of the findings can be found in press release from the University of Michigan New Service: Ann Arbor at https://www.monitoringthefuture.org/pressreleases/12drugpr.pdf.

Reference-

Johnston, L. D., O’Malley, P. M., Bachman, J. G., & Schulenberg, J. E. (December 19, 2012). “The rise in teen marijuana use stalls, synthetic marijuana use levels, and use of ‘bath salts’ is very low.” University of Michigan News Service: Ann Arbor, MI. Retrieved 12/20/2012 from https://www.monitoringthefuture.org