We already have a tax on alcohol up here.
Nowhere in my previous posts in this thread did I ever take a stance on whether or not marijuana should be legal. All I said is that it would take the government a lot of work to get a system of laws and regulations in place for it to be legal.
While there are some substances that are downright destructive no matter who takes them, there are still those that don't affect people in the same manner (alcohol, cigarettes, and marijuana namely). Then, it really boils down the the kind of people who take them.
For instance, Annie, as tragic that it is that alcoholism swept through the aboriginal peoples you spoke of, there have been many long-standing issues within the culture (much of it due to how their cultured upbringing clashed and was devoured by the pioneers and their descendants all the way up to this day). Even if alcohol wasn't introduced into their lives, they may very well have found some other means to destroy themselves. In northern Ontario, for example, the people sniff gasoline or eat glue. The suicide rate for aboriginal peoples is also very high.
In a lofty, fantasy world, you would have to get a license of sorts in order to consume alcohol or drugs after being assessed by psychiatrists and physicians in order to determine how well your body and mind would handle it, and whether or not your own personal situations would lead to abuse of the substances.