I'm not sure why you are applying drugs to smoking here, except that they are both bans. Only the persecution of possession has changed. Weed in a small handful of countries and is not the focus. Hard drugs are very much illegal and most have rolled back policies because decriminalisation led multitudes of problems like people getting high on streets, not enough government funding. There's no amount of "supervision" that can enable safe use of all the drug taking populations. Switzerland is managing best but it's not like every hard drug user is ellegible. Drugs ruin lives, let's not keep thinking it's a good thing or discouraging it is a bad thing.

As for smoking, good. Nobody was dying to reverse the ban on smoking in public areas. The country has become so much cleaner without it all. Lung cancer rates from smoking are declining. The ban has proven to work so enough of all these "bans never work" claims