The societal damage and consequences of having people becoming lazy on their couch after smoking weed is largely underestimated.
This is the real risk with cannabis.
"Randy: Well, Stan, the truth is marijuana probably isn't gonna make you kill people, and it most likely isn't gonna fund terrorism, but… well, son, pot makes you feel fine with being bored. And it's when you're bored that you should be learning some new skill or discovering some new science or being creative. If you smoke pot you may grow up to find out that you aren't good at anything."
Well, also schizophrenia. Hope you like insane people wandering urban areas and harassing normal people, because you're going to get a lot more of that!
This is the real risk with cannabis.
"Randy: Well, Stan, the truth is marijuana probably isn't gonna make you kill people, and it most likely isn't gonna fund terrorism, but… well, son, pot makes you feel fine with being bored. And it's when you're bored that you should be learning some new skill or discovering some new science or being creative. If you smoke pot you may grow up to find out that you aren't good at anything."