[RobertKerans]

The Brexit example is quite good I think, as it illustrates the horse-trading inherent in these things. It was a promise to a wing of the Tory party in exchange for concessions on other issues. From the polls I can remember it wasn't something the vast majority cared about, it consistently came very far down the list of important issues facing the UK. But when the promise was activated, those with political power who were opposed to EU membership managed to make it into an issue, and I think drugs are an area of policy where it is easy to do the same thing, to create and energise a base that had no great feelings either way. It helps enormously that drugs are a taboo subject, and that usage is associated with groups of people that are easily painted as undesirables.