Why would they have to ban it's use anymore than the way they restrict the current use of Alcohol and Tobacco?

If you can't walk the street with an open container, you shouldn't be able to smoke a joint. But if there is an outdoor bar, and the bar owner allows it, and is in a smoking section, how is it any different than how alcohol is controlled and regulated?

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"When two people agree on everything, one of them is not necessary" - Arliss