it probably isn't, but bans don't work either or are simply not effective compared to education. the only places where it works are basically dictatorships where people are obedient and don't make waves about anything. if you're a democracy and have "freedom" as a high priority it simply doesn't work to order people what they have a right to smoke, drink or inject. but what you can do is educate people and it's not even expensive compared to the ludicrous amounts of money spent on the war on drugs. countries like Portugal have demonstrated that quite well.