Sometimes we don't know when to say when. Maybe it's over-eating, drinking one too many drinks, or maybe it's buying things you don't need.
But when does a little excess turn into an addiction? Our series continues with a look at the psychology of addiction. What are the signs of an addictive personality? And how can the cycle of compulsive behavior be broken?
NPR's Tony Cox speaks with Phil Scherer — clinical coordinator for the Illinois Institute for Addiction Recovery — and Terry Shulman, founder of the Shulman Center for Compulsive Theft and Spending.