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David Sulzer, PhD—a professor of psychiatry, neurology, and pharmacology at Columbia and New York State Psychiatric Institute—goes by the name Dave Soldier in his music life.

The first step to quitting nicotine is validating the reasons someone has continued to use it, and identifying their top motivations for quitting says Sam Lookatch, PhD.

Cortisol is a chemical that helps regulate the way our bodies react to stress. “It’s a hormone that connects the mind and the body together,” said Martin Picard, PhD.