I was thinking in terms of a precedent for prohibiting legal drug use in public, rather than the reasoning behind it. Precedent was important in the introduction of the smoking ban.

I dont agree with the prohibition of either, and I would argue that, given that I work with drunks a lot, they are just as inclined to break the law or act badly whether they drink outside or in a licenced venue and then leave. They are still pissed.