I obtain my cannabis legally, through a certified dispensary. Everything's locally grown and organic - no cartel support here.
In fact, I got my license because cannabis was the only thing that enabled pain-free training (I had a nice chunk of cartilage go missing from my left knee). I've since recovered, thanks to intelligent rehab and a non-inflammatory Primal diet, and I can squat, run, and play without pain and without the weed.
The cannabis was, and is, merely a helpful tool in my recovery - as it is for millions of others. And that's a beautiful thing, regardless of what the DARE program says. It was anything but a net "negative" for my health and fitness. I'm living proof that it can indeed be a part of a healthy lifestyle.
It can be abused, of course, like anything. I'd suggest you direct your ire toward rancid polyunsaturated fats and sugar instead, for they're far bigger killers.