There's no possible way you could know that to be true. I can't prove it's NOT true either but I seriously doubt it because of anecdotal experience. When I was in college everybody I hung around with smoked pot on a very regular basis. I can't think of a single one that became a vegetable. They all functioned fine. Maybe they would've functioned even better if they hadn't smoked pot every day and done other drugs as available as well. But they functioned fine.For every successful "functioning" pothead, there are hundreds whose minds have been blown away by chronic cannabis abuse.
Me, I smoked it every day while working a full time job, making a little additional extra money by writing for the school newspaper, and going to school full time. I smoked it every morning with my coffee then I smoked it periodically all day every day.
I don't smoke it anymore but I smoked it for decades. My biggest accomplishments came during that time. In fact I think smoking it enhanced my creativity. Can't prove that; but all of the ideas I had that ended up having an impact on the field I'm in came during that time and I frequently had "Eureka" moments while being high, listening to music, and thinking.
Sure, I can believe it likely that someone can take measurements and demonstrate some impacts of smoking marijuana. But this thing about it being likely to turn somebody into a vegetable who can't function and is a menace to society is total nonsense.










