Rhode Island legalized medical marijuana in 2006, but Massachusetts did not. “We wanted to pair these two states because they have so much in common culturally and geographically,” says Dr. Esther Choo, assistant professor of emergency medicine at Brown University’s Warren Alpert Medical School and emergency medicine physician at Rhode Island Hospital.
Choo’s analysis used data collected from 1997 to 2009 for the Centers for Disease Control and Prevention’s annual Youth Risk Behavior Survey. The analysis involved nearly 13,000 youth in Rhode Island and about 25,000 in Massachusetts. In each state in any given year, the study found, about 30% of youth reported using marijuana at least once in the previous month.
Read more: http://healthland.time.com/2011/11/03/study-legal-medical-marijuana-doesnt-encourage-kids-to-smoke-more-pot/#ixzz1cs7RFa6l