Its been scientifically proven that marijuana is not physically addictive. Mentally addictive? Sure. But so are many other things like chewing gum, over eating, even masturbating. Im not recommending some 17 year old kid start smoking it, but I also dont think that spreading false information is appropriate either.
Alcohol is a stronger, more addictive drug, in virtually every way. IMHO the laws surrounding these substances should reflect that fact. Misinformation, stereotypes, and the almighty dollar keep marijuana's legal status where it is.