I've never smoked a joint and have never been drunk. I have not smoked tobacco either. Not that I didn't have opportunity, because I did, I just didn't want anything to make me less in control of myself. (and before anyone jumps on me, yes, I'm sure some people feel even MORE in control of themselves or whatever...but the people I knew who did any of that did not were not) I had good friends who never pressured me, nor did they always make me be the designated driver/safe person (sometimes it's nice to have another sober person to talk to if you're partying all weekend).
I guess I see the middle ground here. I really don't understand why some people absolutely refuse to see that yes, sometimes it can lead to problems--especially with driving and consentual sex. (That's really what the designated sober people were for when we hung out with people outside our group--to protect our girlfriends from date rape. Far more common with alcohol than other drugs, but it can and DOES happen with others. Sorry.) On the other hand, I don't get the fear about it either. It's far less destructive to the body than alcohol or modern chemical laced tobacco, IMO.
There are herbs that can do damage to the body. Remember Fen-Phen? There's no shortage of poisonous plants, and some hallucinogens are actually toxic--you're just minding the dose. I think it's just as foolish to say/assume that just because something is "natural" it's therefore harmless, as it is to believe that the only way something can be safe is if a multinational pharmaceutical corporation makes it.
I think that decriminalization/legalization, if/when it happens will only happen if/when people can make compromises about it, and stop engaging in villanization of the other side. You can have an intelligent opinion about something even if you haven't toked anything--or if you have. I don't smoke and never will. Maybe that's why I can look at it dispassionately. I don't see the harm in legalizing MJ--and putting similar controls on it as alcohol as far as home manufacture. (you can do homebrew/growing somewhat generously, but if you move to distill/refine it into something else, you are in big trouble). I'd rather see law enforcement concentrate on things like meth, to be honest. But let's be real here. A lot of the same people who are stupid, selfish, or addicted enough to cook meth with their young children in the same house, endangering them are in the same league as people who risk their children's housing and safety by having large commercial growing operations. Stupid is as stupid does/risks. Even if you were to legalize MJ on the same level as alcohol (with some leeway for certain types of home production), you wouldn't get rid of all the stupid and unfit parents and dysfunctional families in the world. Sometimes I think legalization advocates romanticize that bit too much. The people that put their families at risk to make $$ will just probably move on to something else when it's harder for them to sell it. But all things considered, MJ is a fairly mild substance. If people can make their own homebrew, then I don't see why they can't farm their own pot. But I would like to see people acknowledge that it won't empty out the prisons nor will it solve the problem of addicted parents neglecting or doing horrible things to their children if they've reached that point.