Legalize/Decriminalize it.
Fucking marijuana from my experience affects people less than alcohol, and if it does have a larger effect on one of my friends they usually pass out before they do anything stupid.
When I did it I just thought everything was funny as hell and I was really chill.
When I see people drinking they do stupid shit. When I see people smoking they don't usually. It's stupid that Marijuana isn't legal when alcohol is.