This is a question on which I've changed my mind over time. I used to think that punishing users was an important way of suppressing illicit markets, and if that were true, I think I'd still be for it. I think the evidence now is that no country has created enough of a threat on users to substantially decrease consumption. The main impact of punishing users is merely to punish users. This is not merely for cannabis, but also for drugs that we keep completely illegal. I think the practice of punishing drug users is probably a mistake and ought to be abandoned.
On September 14th, 2017. See this statement in context.