No, we dont know that you are right. I dont believe that the evidence is in your favor either but as I do not have sufficient evidence to state it as fact, I have not. There are places that we could look if we wanted to sink the time. Holland for one has legalized pot and shrooms as well as unofficially legalizing cocaine (you can openly purchase and sell cocaine in red light districts and no one will question you). Canada has made some interesting laws in regard to heroine as well.
All that is beside the point though. Whether or not more are getting high or using is not actually the end determination as to how harmful the drug is. As pointed out, controlled substances and open treatments are beneficial to the users particularly if you are changing to that from prison. Prison where continued use is actually encouraged by the grater hardships that you are going to face for damn near the rest of your life.
Regulation is not really a compromise. It is a reality of any commercial product and would be integral to legalizing drugs. Unregulated drugs would look like, well, what we have now
It is not a matter of acceptable level. It is more a matter of general safety. I said, directly, that rugs would never be good. We are not regulating them to a positive or benign substance BUT there is no argument that what Joe the crack dealer bakes in his basement would be safer than a regulated and controlled product.
You realize that we actually do regulate, control and distribute such hard drugs already, right? Methamphetamines and opium are already legal in very specific instances. They are not as harmful as the street variety of the same drugs. Here is a shocker also; meth is not administered as a medical solution either all the time. There are other uses that the federal government uses it for.
The reality is that people are going to get high. I have seen people smoke banana leaves and tea bags. People smoke bath salts and sniff whip cream cans or refrigerants (all far more dangerous than the hard drugs out there btw). They huff paint cans and markers. There are plenty of options in the world around us to get high that are not illegal at all. Most are far more dangerous though. The idea that we need to outlaw these few substances is crazy as we are not preventing anything. They still get high, get hooked and die. Instead, we need to practice openness, regulation and treatment, not prison, concealment and black markets.