I don't smoke, drink, do any drugs, or use marijuana, but I definitely think that marijuana should be legalized. It's a huge travesty that all this time and money is being thrown away on tracking down and locking up pot smokers, who cares? If they legalized it they could regulate it and it would really help the economy (legal business, taxes etc.) and it would take the power out of criminal hands. If alcohol and cigarettes are legal than marijuana might as well be too.
They did try banning alcohol at one point (prohibition) and that went horribly, huge spikes in crime and the rise of gangsters like Al Capone (why let violent criminals make money off of this stuff when the government and businesses could be benefiting from the sales income?) and they finally decided it wasn't worth prohibiting and brought it back, which made things better for everyone, including non-drinkers. Again, I don't use any of these because I think they're all disgusting but if people want to use it then who am I to say no? Just keep it away from me. I just realize that it isn't practical to keep these things prohibited, it costs too much money and there's just too much wasted effort. Everyone would benefit from the legalization of marijuana, same as tobacco and alcohol. The only thing I'd ask is that they make it illegal to smoke it around others who don't want to get high from the second-hand smoke (i.e. do it at home, not in the store or in public please).