I have a mixed opinion on this. One the one hand, I don't like drugs because of the dependence it's builds on its users, the harmful medical effects in the long term, and how many people use it while driving or doing other dangerous tasks (for those that cause incapacitation). This isn't just my opinion for marijuana, but for other drugs such as alcohol and tobacco.
However, I don't want people who do use it to end up paying massive fines or ending up in jail, because ultimately they are victims. Of course, the reason this isn't the case for alcohol and tobacco is because of its historical foundation in the US.
So I guess I'm left wondering what is an ideal solution for this problem? My best guess is to decriminalize, but also help improve resources available for treatment of addiction and education of its medical effects.