The election results this week from Washington, Colorado, Massachusetts and Arkansas demonstrate that public opinion about cannabis has moved much faster than the positions of elected officials. That Massachusetts voters would pass a fairly loosely regulated medical marijuana system isn’t very surprising. But that voters in Arkansas came within a whisker of passing one shows that it isn’t just a hippie-dippie issue anymore. And for Colorado and Washington to take the plunge into full legalization – not just of use or for medical purposes, but full-scale commercial growing and sales – marks an epoch.