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.

Dopamine makes up less than one percent of the brain's neurotransmitters. It's a small portion. Dopamine is released when people are happy, angry, stressed. So it's really hard to call this specific neurotransmitter "the pleasure neurotransmitter."

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.

I've had investigations of my lab because people didn't like what I had to say. And when you have investigations and you're doing research, you're shut down for a while. You have to start all over again. So that's one area where I paid a high price.

Crack in the early 1980s or mid 1980s I'm sorry is that one of the worst myth is that one hit and you're addicted for life. We saw that in 1980s and we're seeing it again with methamphetamine today, one hit and you're addicted and it simply not true, addiction requires work not the people should go out and experiment or do these themselves but the fact is that's a myth and the concern is that, it's dangerous because when people perpetuates that myths and then when young people are people actually try methamphetamine or crack cocaine and find that, that doesn't happen to them.

I am glad that people are trying to have a rational conversation about drugs.

You have rappers saying "stay off drugs, go to school" - empty verbal behavior. I think all of this became institutionalized in the early '90s. And it's become more and more solidified, more and more entrenched.