Effects of State Medical Marijuana Laws on Adolescent Marijuana Use

The researchers used data from the Youth Risk Behavior Survey and a difference-in-differences design to evaluate the effects of passage of state medical marijuana laws (MMLs) on adolescent marijuana use. The states examined (Montana, Rhode Island, Michigan, and Delaware) had passed MMLs at different times over a period of 8 years, ensuring that contemporaneous history was not a design confound."

-Excerpt from The American Journal of Public Health.