The 5-year experiment that is Colorado’s pioneering legalization of recreational marijuana now has enough data for more than conjecture to debate its success.

The state’s first dispensaries began legal recreational sales on January 1, 2014. In 2014, combined recreational and medical sales totaled $683.5 million, and are expected to top $1.5 billion in 2018. Over the 5-year period, recreational sales generated 78% of sales revenue. The most recently published sales data shows combined 2018 sales though October of $1.27 billion.

$247 million in tax revenue

Tax revenues jumped 266% during the period, from $67 million in 2014 to $247.4 million in 2017. Colorado’s tax revenues have risen each year since recreational legalization, and currently represent about 1% of the state’s 2018 - 2019 fiscal year budget.

Marijuana taxes are spent on public school projects, human services, public affairs, agriculture, labor and employment, judicial affairs, health care policy, transportation and regulatory affairs.

The financial data, read together with a social impact report released this week by Colorado’s Department of Criminal Justice, is insightful for Colorado and states considering legalization.

The report presents a mixed bag of encouraging and frustrating data.

The number of marijuana-related arrests during the 5-year period, shows overall arrests decreased, including for African-Americans, though African-Americans were arrested for such offenses at double the rate of whites.

DUI traffic citations with marijuana-impaired drivers increased 3%. In a subset of arrest data from 2016, where blood tests were performed, 73% returned a positive screen for cannabinoids

“The number of fatalities with cannabinoid‐only or cannabinoid‐in‐combination positive drivers increased 153%, from 55 in 2013 to 139 in 2017,” the report states, going on to note that “detection of cannabinoid in blood is not an indicator of impairment but only indicates presence in the system.” Fatal traffic accidents involving a THC-positive driver, on the other hand, decreased 5%.

Cannabinoids characterize both THC and CBD. Cannabidiol “CBD” is a non-psychoactive biochemical found in hemp and marijuana plants. Tetrahydrocannaabinol “THC” is the psychoactive biochemical found in marijuana. Both biochemicals are cannabinoids that interact with neurotransmitters, known as the endocannabinoid system.

Marijuana-related hospitalizations, including possible marijuana exposures, diagnoses, or billing codes, increased from 575 in 2000 to 3,517 in 2016. Emergency room visits and calls to poison control related to marijuana increased.