I also had my own addiction to cocaine and heroin in my 20s. I knew that it was driven not by the things that the drug workers were telling me; in fact, I couldn't believe any drug information that was given to me by authorities because I knew from my own experience that it was wrong.

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.

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.

Because of the war on drugs, pain patients are treated with skepticism and pain doctors live in fear of being prosecuted for overprescribing. The end result is that addicts still get their opioids without much trouble, while genuine patients often can't find treatment. Those who do must typically be tracked in a database and must schedule frequent, expensive doctor visits for surveillance like urine testing.

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.

We absolutely should legalize marijuana.

Marijuana is not not harmful, but is the least harmful psychoactive substance that we have, with the possible exception of caffeine.