Daniel Rees and colleagues published research this month that found legalizing pot does not appear to encourage teen use and might actually discourage it.

New JAMA study shows legalizing pot might discourage teen use
CNBC, July 8

Study: Teen Use of Marijuana Drops in States Where It Is Legal
US News and World Reports, July 8

New JAMA study shows legalizing pot might discourage teen use
Yahoo Finance, July 8