Well nothing else was working. People know the negative effects of drugs, and yet they still choose to submit themselves to them.
I say let them.
Now, I'm not saying people don't do the same with alcohol and cigarettes, but we can't assume we can fix drugs by taking a more scientific and peaceful approach to it. It doesn't work. Some things need to just be straight up banned because there is nothing good that comes from them.
Why do you make a distinction between alcohol and tobacco and other drugs?
Drugs are too dangerous to have people waste time experimenting with how they effect each individual life, because we know they do harm to the majority of the people involved after a certain amount of time. We scientifically know this happens. . .
Actually, we know that the majority of the people use addictive drugs (e.g. alcohol) regularly throughout their lives without any severe adverse affects.
and now we need a stronger force to enforce it because people themselves won't take that responsibility.
That was tried with alcohol and it was a dismal failure. In addition to any social and medical problems that the abuse of alcohol may have had, it compounded the cost to society by adding a severe criminal aspect to its illegalization.