1. Colorado Joint Select Committee Legislation:Amendment 64 Implementation.https://www.colorado.gov/pacific/sites/default/files/13%20Amendment%2064%20LEGIS.pdf(2013). Accessed 15 Mar 2021.
2. Washington state initiative 502.https://www.sos.wa.gov/_assets/elections/initiatives/i502.pdf(2012). Accessed 15 Mar 2021.
3. Hansen C. Alas H.States where marijuana is legal: A guide to marijuana legalization. U.S. news and world report: Best states.2020.https://www.usnews.com/news/best-states/articles/where-is-marijuana-legal-a-guide-to-marijuana-legalization. Accessed 15 Mar 2021.
4. Colorado House of Representatives:116th congress. HR‐3884.https://www.congress.gov/116/bills/hr3884/BILLS-116hr3884rh.pdf(2019). Accessed 24 Feb 2021.
5. In the weeds: a baseline view of cannabis use among legalizing states and their neighbours