But...
What about crystal meth? I've never tried it, but I hear so many terrible things about it.
It is pretty dangerous and seems to really mess people up. Been fortunate to have seen relatively little of that around here so far. It's also incredibly dangerous to cook up yourself, particularly if you are using at the same time...I would say keep manufacturing as a crime and decrim possession or at least make it a misdemeanor as a way to funnel people into treatment programs.
Also, being high on any of these drugs, just like alcohol, is no excuse for other criminal behavior. If you wreck because you are geeked up, it's DUI. If you beat your wife because you are high on meth, or have a cocaine psychosis and go crazy on cops, you are still going to jail, just not for the drug part.