We believe that the latter best describes a true addiction.
Addictions can be to substances, persons, or behaviors.
An addiction often begins as a playful enjoyment of a perfectly normal, usually, but not always legal, thing that is completely socially acceptable. There is a very fine line between moderate usage and addictions. I'm embarrassed to have certain people know how much I crave it. I find myself making excuses for it. Sometimes, I even lie about it.