I guess the question I would have is - and this isn't meant to come across as though I have a preconceived answer - what evidence do we have that legalization (

I guess the question I would have is - and this isn't meant to come across as though I have a preconceived answer - what evidence do we have that legalization (plus, for instance, a ban on marketing) would actually increase usage? I know it's intuitive to think it would, but is there data? We do know for a fact that usage of many hard drugs is increasing when illegal. And this is on top of all the negative outcomes associated with making it illegal - guns, gangs, prison, felony convictions. Is making it illegal slowing the uptake? By how much? Is it making the problem worse?