"Based on the research to date, the harms associated with the actual use of cannabis likely pale in comparison with the widely observed harms attributable to cannabis prohibition. As such, policymakers should integrate the scientific research conducted on the likely impacts of current prohibitive approaches to cannabis use into the process of optimising cannabis policy."
Source
Werb, D., Fischer, B., & Wood, E. (2010). Cannabis policy: time to move beyond the psychosis debate. The International journal on drug policy, 21(4), 261–264. doi.org/10.1016/j.drugpo.2010.03.003
