How could you regulate a plant?! That's why it's 'illegal' ...the government cannot regulte it, cannot profit from it so they make it illegal.
I do agree that smoking pot as a young adult will cause short term memory loss. I grew up in a home where both my parents had smoked ever since I can remember and I too experimented at an early age and it messed up my ability to concentrate and remember things.
But in other ways it taught me a lot. Opened many things that expanded my imagination, the creative process and my ability to tranfer this into my artwork.