I think what's fundamental here is deciding whether drug use represents a criminal law problem of morality or a public health issue. If we think it's a public health issue...and here's where I come back to saying let's put all the legal and illegal drugs on the same page. We have 35,000 deaths a year from tobacco. It's the most addictive drug known. There are two drugs that I would suggest people never put in their systems--heroin and tobacco. We have to start comparing legal to illegal drugs. We have to put them on the same page. It makes no sense to do otherwise.
So I just don't believe in a criminal law enforcement model as the most productive way to go. Having said that, there are exceptions to it. I'm a bit of a cautious person. I look at examples from around the world, and I see that decriminalization of cannabis can work and not give us any increase in difficulty. I see that with heroin you can use prescriptions and other mechanisms to deal with that form of addiction. I have yet to see any effective way of dealing with crack and crystal meth outside of prohibition, so I remain committed to prohibition on those substances.