And this isn't a hypothetical: more than 12 years ago, Portugal decriminalized possession of all drugs -- from marijuana to heroin -- and plowed the money saved by no longer jailing addicts into treating them. The result has been lower rates of addiction and HIV infection, and higher rates of treatment:
http://www.alternet.org/story/151635/ten_years_ago_portugal_...
Now possession is a misdemeanor, like a traffic violation, punishable by a fine or community service, and accompanied by a screening for risk factors of addiction, with encouragement to enter treatment programs:
http://www.spiegel.de/international/europe/evaluating-drug-d...
It hasn't been a magic bullet, but nor has it been a disaster. And what is a disaster is the current policy: drug money fuels endless violence and murder inside the US and across central and southern America.
The social fabric of my home country (Trinidad & Tobago) is being torn apart by violence from drug trafficking, and there's nothing we can do about it as long as the amount of money to be made by risking the drug trade is so enormous. We can't lower the price, because we are not the market: the US is.
I wish more people in the US were aware that their paying $100/gram for the occasional fun evening is paying for murder on the streets of my home town. And I wish more people realized they don't have to stop taking cocaine; they just have to lower the damn price.