I do believe marijuana should be legal. Medically, it does have several possible benefits. These could be better explored without the government harassing scientists.
Our prisons and court systems are clogged with simple possession cases. It has been well-documented that marijuana is less dangerous than alcohol. It is not a gateway drug and doesn't foster crime.
Up here in Alaska I live in a weed culture. By choice, I rarely partake, but I witness firsthand it's effects on people and society around me. I see smoking weed as being fairly harmless. Now truth be told, most of my pothead friends are not overly motivated, but most go to work everyday and function just fine in life. Most importantly of all, they are happy.