J Megan Ross, Hollis C Karoly, Stephanie M Zellers, Jarrod M Ellingson, Robin P Corley, William G Iacono, John K Hewitt, Matt McGue, Scott Vrieze, Christian J Hopfer
Background: As more states pass recreational cannabis legalization (RCL), we must understand how RCL affects substance use. Objectives: The current study aims to examine the effect of RCL on lifetime and past-year use of cannabis, alcohol, tobacco, and other drugs, frequency of cannabis, alcohol, and tobacco use, co-use of cannabis with alcohol and tobacco, and consequences from cannabis and alcohol use. Methods: We used a unique, co-twin control design of twin pairs who were discordant for living in a state with RCL between 2018 and 2021...
June 1, 2023: American Journal of Drug and Alcohol Abuse