Personally, I think that everyone that wants to legalize drugs should be required to work in a drug rehabilitation facility. I'd like to know what their ideas would be after spending a year watching all of that.
Are there lots of marijuana-only consuming individuals in rehab? If so, are they there under their own will to escape the spiraling burden of Funyuns and gallons of chocolate milk or are they being forced into rehab in order to keep state $$$ flowing and pad political numbers, and most importantly, avoid incarceration?
I don't know a lot of weed-injecting, Sativa-snorting, Devil grass junkies, but the ones I do are not out there on the streets stealing cash, pawning stolen items for cash, prostituting for cash, or even simply begging for cash in order to keep afloat an addiction to which they're anchored. I would bet the sad stories you're referring to are those addicted to Rx meds or man-made crap drugs slapped together in some white trash dude's trailer.
While they have backgrounds in draining their savings accounts, stealing, prostituting, losing their families, their jobs, their homes, etc, all due to their addiction, you have Darryl the Doper over there telling everyone how he smoked a joint and before he knew it, he had watched three whole episodes of Spongebob and ate an entire bag of Family Size Cool Ranch Doritos.