Links
[1] http://www.samhsa.gov/data/sites/default/files/NSDUHStateEst2012-2013-p1/Maps/NSDUHsaeMaps2013.pdf
[2] http://rethinkpot.org/tags/survey
[3] http://rethinkpot.org/tags/study
[4] http://rethinkpot.org/tags/youth
[5] http://rethinkpot.org/tags/increase
[6] http://rethinkpot.org/tags/usage