1-Its a matter of personal freedom, jsut like alcohol and tobacco.
2-If it affects motor skills it should not be used while driving nor operating equipment, vor for people like surgeons, while opeerating. Thats jsut common sense.
3-From what Ive seen and read, and people Ive spoken with, it is much better used in and edible form. YOur lungs were made for air, not smoke. I have limited experience with the CBD' tried them and didnt get much result, but am willing to defer to to those who have positive personal experience.
4-As to the other substances mentioned above, LSD, Psilocybin, MDMA, and the like. Read Albert Hoffmann's book, 'LSD My Problem Child'. LSD was developed in the 1930' by Sandoz Pharmaceutical Company, a Swiss firm, SPECIFICALLY for the treatment of psychological disorder. It was used for years here in the US for that exact purpose, until the idiot Timothy Leary ran his stupid yap and things got out of control and ruined for every one. I did a research paper on it while at UVA and spoke with Dr. John Buckman, the head of the Psychiatry Dept there.
What they found is that was very valuable in cases of severe emotional trauma. And example he quoted: A little girl was molested by her grandfather. the memory is so painful that she buries it deeply in her subconscious for survival, but when she grows up and meets her guy and tries to become intimate, she cringes, but cannot explain nor understand why. years of therapy are of little help because the memory is jsut too painful t allow to surface. The literal meaning of the word psychedelic comes from the Greek words 'psyche (mind or soul) and delos (manifesting). Using some of those substances, in conjunction with therapy, the mind is allowed to relax, and the memory surface and be dealt with...in line with "You shall know the truth and the truth shall set you free.
Why shoud such a beneficial substance be banned when the garbage big pharma spits out is used and destroys? It just needs to be used with wisdom and caution, like any other powerful agent, including guns.