There is only one way to find out. Legalize it. We already know the war on drugs isn't working. Let's see what happens if we start to legalize certain drugs and see how it affect crime etc. The question is, are you the type of person that would actually change his opinion on the matter if he was proved wrong?
I disagree. It's like cutting your arm to see if it slows the bleeding in your leg. Roll back the nanny government first. You can't legalize a dangerous product while another similar dangerous product is being slowly outlawed. You have to get the government out of the business first.