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. Author manuscript; available in PMC: 2021 Jan 1.
Published in final edited form as: Am J Perinatol. 2019 Sep 6;37(1):59–65. doi: 10.1055/s-0039-1696719

Figure 1. Marijuana and other substance use over time, 2012–15.

Figure 1.

Substance use by year across marijuana legalization for recreational use in Colorado. Use as measured by self-report or as detected by biological sampling. The arrow indicates the opening of recreational marijuana dispensaries in Colorado on January 1, 2014.