“The state-level legalization of medical marijuana has raised concerns about increased accessibility and appeal of the drug to youth. The objective of this study was to assess the impact of medical marijuana legalization across the United States by comparing trends in adolescent marijuana use between states with and without legalization of medical marijuana…
CONCLUSIONS:
This study did not find increases in adolescent marijuana use related to legalization of medical marijuana.”
http://www.ncbi.nlm.nih.gov/pubmed/24742758