analyze thc content of hemp and demonstrate that smoldering hemp doesn't get everyone high in the room :P
ooo actually there was a recent article
http://abcnews.go.com/blogs/health/2012/08/27/teenage-marijuana-use-may-hurt-future-iq/
take sample set of mice. divide into control and experiment groups. subject each group to various amounts of pot. test intelligence with maze memorization.
if pot is an issue, do alcohol instead. teach those teenagers that binge drinking is bad for IQ