I still have an old pair of hemp pants, the fibers are so tough you can weave it into fabric.
Too much of anything is a bad idea, and we are already dealing with the effects of alcohol abuse, like Hurlshot said, disfunctional families, drunk drivers etc. But whats to be done about that, bringing back prohibition ?.
If we didn't use so many resources policing drugs we could more effectively do something about those secondary effects. As it is we are presenting an easy avenue for people to make money illegally which we do our best to band aid with policing. Making most drugs legal is the better structural choice, but the public does not agree, certainly not those who typically vote.