Personal opinions. It's been over twenty years, but;
Don't legalize, but decriminalize marijuana - I would enjoy a relaxing smoke every now and then without risking a trip to the underworld to purchase.
Cops do have the best dope. Trust me on this. I've bought it from them and they have taken it from me.
Alcohol has killed more people than Marijuana. I've had to break up too many fights, domestic disturbances and been to too many funerals.
If you're impaired (regardless of the substance), you shouldn't be on the road and if caught, you should go to jail. Period.
Cocaine: I'd go broke (for a second time) if it was legal.