Earlier quoted context omitted.
Pretty sure alcohol is way harder on your body than edibles or vaping cannabis. Alcoholism has a huge blast radius.
I feel like it's likely a larger proportion of weed-users have it affect their productivity and motivation to grow in life than the proportion of drinkers who become dangerous alcoholics or end up with cirrhosis. I don't have data to back this up though. I've seen more lives around me hampered by marijuana than by alcohol, despite having a very large amount of heavy drinkers in my circles.
However as far as actual physical health (rather then mental or social) I believe cannabis to be far less detrimental.
It might demotivate a person but it doesn't flat out kill them.