In reply to jfmchivall:
Sensible stuff.
There has been an unintended experiment on the legalisation of drugs going on for the past 5 years in this country - the advent of 'legal highs' that are damn near identical to illegal drugs. Synthetic cannabis, different versions of speed, ecstasy tablets stronger and more reliable than those from the black market, and tabs of hallucinogens every bit as strong as acid have all been available legally to anyone who is interested. And what has happened to society? Nothing.
Looking at the synthetic cannabis, it didn't open up a new market of people who wouldn't smoke weed because it's illegal, but still wanted to get stoned. It opened up a market of people who were already into drugs and saw the legality and ease of purchase via the internet as an added bonus. And since the drug had all the downsides of weed and wasn't quite as appealing, I'm pretty sure that the numbers of people consuming it was/is (there are still some available that haven't been banned) much much smaller than the number of people smoking weed (it's a shame no data was collected on this, so I'm guessing really but it seems obvious what's happening). People who take drugs just don't give a shit whether it's legal or illegal. They care how good it is, whether their mates take it, and how easy it is to procure.
So if you legalise drugs - as has basically happened on the sly in the past 5 years - then nothing happens, because everyone who wants to take drugs is already doing so.
There was a bit of a difference with mephedrone, which I think quite a lot of kids who wouldn't normally take drugs did get into, but that had a rare combination of associated factors (being sold at a fiver a sackful including home delivery and being incredibly addictive, plus being novel and there being zero education about it).
Now that anyone with a brain in the ACMD has been sacked or has resigned, and only people prepared to tow the govt line are allowed to conduct "objective analysis", virtually all of these new substances have been banned. The 'legal highs' scene that emerged from 2008 or so was an impromptu experiment that could have ended in the regulation of recreational drugs. That would have allowed much, much safer products to have been sold to teenagers with good information, and their safety monitored to spot emerging health issues. But no one had the brains or the balls understand what was going on and to seize the opportunity to develop policy to serve and protect the public while disrupting the activities of criminals. Instead, we've just kept the status quo because everyone's happy with that: no control over what kids are taking, and huge sums being made in the black economy with all the associated crime and harm which that entails.
People in general are stupid, and there is nothing that the rest of us can do about it.
Post edited at 18:02