I think that weed should be decriminalized, maybe cocaine too!
No one will convince me that a person who comes home from work and has 2-3 matinis, beers, glasses of wine, etc., will be healthier than a guy who comes home and takes a couple "hits".
Medical science has already proven the negative effects of alcohol on humans, there is not a lot of evidence of long-term negative efects from marijuana use.
Decriminalize it, tax the hell out of it like cigarettes and alcohol, and let the FDA put standards on it so there wouldn't be harmful additives, (like nicotine, D'oh!!!).