If you ask an addict why he takes drugs, he is likely to say that he likes, or enjoys them. To someone who has witnessed an addict's behavior that may seem astounding, even impossible, but it's true. In The Essentials of Chemical Dependency, the McAuliffes have examined and isolated the essential factors of addiction-those characteristics which all addictive behaviors have in common. The most amazing characteristic of all is that addiction is a love relationship. Robert and Mary McAuliffe have defined it this way: "Chemical dependency is essentially a committed pathological love relationship...