If you read the article you would have noted that the law only legalized smoking lounges. Places where people could go to socialize and smoke marijuana. Presumably indoors to avoid exposing the public to the second hand smoke. It didn't make being intoxicated in public spaces like parks, roads, etc. legal. Basically the same as a bar, or music venue, or sports stadium that serves alcohol. You can go there and drink but it is your responsibility to not leave there and enter the public space overly intoxicated.