An interesting take, straight out of "Hugs not Drugs!" But also utter bullshit.
Legalization leads to less abuse by youths, and less abuse overall, lower rates of addiction, and less overall harm.
If you're really trying to "protect" people from dangerous drugs and their ill effects on society, you should be working to legalize or decriminalize just about everything, since the Netherlands experiment shows pretty conclusively that young people have less access to drugs in a legalized marketplace (because black marketeers don't check ID) there's less experimentation among youth, less addiction among youth, and less addiction overall in society. Overall, fewer people take drugs in the Netherlands now that they're de facto legal.
Interesting if true. I'm big on letting people ruin their own lives if they want to. My largest concerns are how it affects people who choose not to take the drugs, and how many children are able to get their hands on them. So I would want to see some very detailed studies, not just on usage numbers, but on how their used as well. Along the lines of alcohol. We know that making it illegal didn't stop consumption, but would people be less likely to drive drunk if even getting caught having consumed alcohol would get you thrown in prison?
I have the same concerns for items such as LSD. If it became legalized, would people be more likely to consume it in public places, while driving, or at other times where they would be more of a danger to others? Would they be more likely to spike food/drink with drugs because they think it's funny? I don't know the answers to these questions, and I'm not implying the answer is likely yes. If everything looks good, I would happily support full legalization.
Maybe we could even take advantage of human nature for a little drug social engineering too. Legalize everything except marijuana. Make it legal to grow and sell in the US to keep down organized crime and drug cartels, but illegal to smoke. Even that can just be a misdemeanor with maybe a fine and community service, but leaving it just edgy enough that kids will tend to favor marijuana as a recreational drug and thus do less damage to themselves than with other options.