Updated: Nov 21, 2019
The opposite occurs when states adopt recreational legalization. The most impacted are urban and poorer communities.
From the study: Recent decades have seen substantial liberalization of marijuana laws in states across the U.S., starting with decriminalization efforts, followed by legalization of marijuana use for medicinal purposes, and more recently encapsulating full recreational legalization initiatives, with such laws consistently focused on adults aged 21 and above. Although adolescents are not directly targeted, nonetheless access and signaling theories argue that such policies may increase access to marijuana and decrease perceptions of harm, thus leading to positive impacts on adolescent use of marijuana.