They already are. In the form of alcohol and tobacco. Explain to me what's the real difference between the lot of'em. And yes, I have experienced the majority of them at one time or another over the course of my life. Currently, I partake of none. I do not smoke pot. When I tried it all it accomplished was making me hungry and paranoid. My physique makes it painfully obvious that I have no problem with hunger, so why pay to be paranoid? And no, I am not a libertarian.
Please, someone "enlighten" me. d:^)
Alcohol effects you today. The mind altering effects of pot and LSD are long term and insidious. And the paranoid effects you speak of are real and not body fat related and can and sometimes do become psychosis.