Healthcare utilisation over 2010 to 2014 in Colorado, site of implementation of the 2012 recreational cannabis legalisation policy, and in New York and Oklahoma, control states without cannabis legalisation. Healthcare utilisation over 2010 to 2014 in Colorado, site of implementation of the 2012 recreational cannabis legalisation policy, and in New York and Oklahoma, control states without cannabis legalisation. The total number of admissions/1000 population per year, the median length of stay per year and the median costs per individual per year are shown in panels A, B and C, respectively, for the three states. Error bars denote IQRs. LOS=length of stay. Francesca N Delling et al. BMJ Open 2019;9:e027432 ©2019 by British Medical Journal Publishing Group