I can't comment on the US situation, which was the original question posed, so sorry if this is considered straying, but...
Here in the UK weed is pretty much decriminalised now - you might get it confiscated or even fined if it's a small amount but you won't get a record for it. As the situation stands it's pretty tenable - as far as the law is concerned it's still an offence so it deters people from doing it in public places (keeps the naysayers happy...), and people are more or less free to do as they wish within their own homes. I guess the only people who have it tough are those that deal it, but I'm sure they make enough money out of their hardship
It has been said before, but one of the more compelling arguments for legalisation is that weed smokers as people do not tend to become violent and likely to commit other offences whilst under the influence. And thus the policing of them is somewhat a waste of resources. A far more convincing case could be made against ******* being legal - I seldom walk along the boardwalk, where most of the Nightclubs are in Bristol, on a Friday night without seeing the aftermath of a ******* brawl. Especially in the UK we have a culture of getting near-*********** pissed, it brings about a kind of fearless attitude that in turn seems conducive to committing crimes. As well as that there's countless cases of tortious liability - Nuisance I gather is fairly easy when you're *****...
Legalising one ****, because another that is seemingly worse is already legal is no argument, but declassifying it as a harmful substance (as has been mooted many times over here) seems only a logical step. ********* clearly has a practical medical use, and is less harmful both to the individual and socially than ******* or baccy. The point about weed users driving is a strong one, I know people that do it and say it makes them a better a driver, but given how the **** affects reflexes and general response time that clearly cannot be the case. However I'm sure not being able to drive is a small sacrifice for smokers everywhere to make, if it meant they could have a joint without continually being paranoid about being arrested.