I certainly agree with your first statements, but the part about it not doing anyone good I would disagree. Firstly, there have been some amazing pieces of music and art that could be partially credited to the use of marijuana.And, of course, they're right. It may not be as bad as the feds make it out to be, but smoking weed is not going to do anyone any good.
Also, it is good for the economy. Think of the retail sales of delivered pizza, video games, dvds, musical instruments would be at without the use of marijuana.