In the first chapter, we investigate the changing landscape of America’s marijuana legislation. We first build a theoretical model to determine the impact of these changing laws on adolescents and take a closer look at the intricacies within the market. Then we provide an empirical analysis to test our hypotheses and improve upon econometric models used in previous research. We use data from the Youth Risk Behavior Survey (YRBS) administered from 2009 to 2017 in the United States. Our identification strategy included a non-linear generalized difference-in-differences approach and a group-time treatment effect. When focused on adolescent usage in the past 30 days we find consistent significant decreases in the probability of usage regardless...