If you're worried about a kid and drug use, the safest, best thing to do is individual counseling or family therapy, none of which will expose kids to more deviant or problematic peers and both of which are proven to be effective and at the very least, they won't hurt.

Science could never get you to make alcohol and tobacco legal and marijuana illegal. Only racism can do that.

We should not be putting kids in cages and hoping that is going to fix their psychological problems of any type.

I know that sounds really extreme, but if you just look at the history, you will find Harry Anslinger [first U.S. commissioner of the Bureau of Narcotics] going on about satanic swing and how reefer will make black people think they're as good as white people - which to him, obviously, was a very horrible outcome. This is the basis of our drug laws.

Addiction is when you fall in love with a drug instead of a child or a lover and the learning that takes part in that part of the brain is designed by evolution to get us to persist despite negative consequences to do what we need to do - because I don't know anybody who could survive a relationship or parenting if not for the ability to persist despite negative consequences. The problem is when that gets misdirected to a drug and then you can find yourself in some very negative and potentially deadly situations.

Do we really want to base our 21st-century policy on what the colonialist preferred at a certain time in history, not at all based on health or what the preferences of different cultures might be? That's just ridiculous.

A lot of addiction actually ends by age 30 - something like 50 percent of all addictions with the exception of tobacco - and I think a lot of what's going on there is that the self-control areas of the brain are finally developed enough to be able to stop yourself from relapsing or just continuing. There is a maturational aspect to it as well.