The "addiction" doesn't have anything to do with particular drugs, it's an underlying flaw that can be triggered by more or less anything that's enjoyable enough and meets a few other requirements. Sex, gambling, food, eating one's own hair, huffing glue, cutting oneself, and the list just goes on.

Dependency on the other hand is a tangible scientifically provable phenomenon that can be cured in a matter of days for any drug. Cocaine dependency is no different from caffeine or nicotine dependency and is over after 3 days of abstinence.