I know a lot of folks who smoke pot (who I'm AWARE smoke it, anyway), and I can only think of two who hold regular jobs, are productive members of society, and have solid ethics. Neither of them have personalities that are prone to addiction, either, though, and I think that has a lot to do with it.
I know, I know, pot "isn't addictive" but I really believe that although maybe it isn't chemically addictive, people can become addicted to whatever high/feeling they get from it. There's absolutely nothing chemically addicting about gambling either, but apparently people get "addicted" to that, so where's the difference?