Results showed that regulated marijuana businesses brought "little change" to youth marijuana use. However, the perception of access, or how easy the public thinks it is for children to access marijuana, has increased significantly since legalization, according to the study.
The study looked at results from forty schools featured in the Colorado Department of Public Health and Environment's Healthy Kids Colorado Survey, comparing the rates of self-reported marijuana use, ease of access, and perceived harms among middle school and high school children in 2013 to the same categories in 2014 (the first year of recreational marijuana sales), while also measuring the proximity of dispensaries to schools. According to the study's conclusion, adolescent marijuana use behaviors, wrongness of use, and perceptions of risk of harm were unchanged from the previous year's baseline.
"In the first study of adolescent marijuana use and perceptions after state retail implementation of recreational marijuana, there was little change in adolescent marijuana use," the study reads, "but a significant change in perception of ease of access." While the schools studied in the Healthy Kids Colorado survey didn't show a rise in use, the perception of how easy it was to access marijuana grew from 46 percent to 52 percent from 2013 to 2014.
Letting the data speak for itself, the study's authors — Scott Harpin, Ashley Brooks-Russell, Ming Ma, Katherine James and Arnold Levinson — weren't quick to jump to any conclusions. "Public health workers and policymakers should continue to monitor these changes as essential for evaluating the impact of liberalization of marijuana policies," the study concluded.
According to the Healthy Kids Colorado Survey, the rate of children of all schools surveyed who had used marijuana once in their lifetime or in the past thirty days had both risen 1 percent from 2013 to 2015.