People rarely die from heroin alone, it's the combination that's deadly. Maybe we should blast that out as a public health education message. That way at least we're keeping people safe.

I have three boys. And I wanted to make sure it connected with them and then those guys who grew up like me, in environments like me.And then I knew something about science that your New York Times reader would be interested in. So I was thinking about it in multiple ways: I'll connect with the people who grew up like me first, and then the New York Times reader will be interested in the science because it's so good and they want to be "in the know."

When you have the national narrative being "crack is awful and black people are using it," why go against that narrative when you want to get that publication in The New York Times or wherever? It encourages people to play right into it.

Our ability to study the brain has been limited because of our tools and our tools have only allowed us to look at one neurotransmitter and we haven't looked so much into co-localization and co-release of transmitters. Our thinking is hampered by our tools.

I think about my cocaine use. I liked it. I thought it was a great drug. But I knew that if I was doing that almost exclusively, I wouldn't be able to continue to also have significant others and a wide range of other things. And I wasn't special. A number of people, including the people I was doing cocaine with, also behaved the same way.

If we want to think about racism and how it might play out in drug policy, we have to think about the trial of George Zimmerman. We think about the prosecution, when they said "race is not a factor." It's so dishonest.

Writing in a nuanced way, getting at all the details in a way that remains interesting for the reader, is very difficult.