I don't use it myself. I just don't like the idea of doing anything that impairs my judgment, whether that's smoking something or simply not getting enough sleep. I don't think it should be illegal, though. Laws should prevent victimization, IMO, but that's about it. That's pretty much how alcohol laws work. You can use it as long as your usage doesn't harm anyone else. I think pot should be the same way, and I think you'd find that cases of victimization as a result of its use are far rarer than such cases for things like alcohol.