Once again, I find myself in (very general) agreement with Vinter.
Addiction and dependency are two different things, and while addiction by definition implies some type of dependency, the converse is not necessarily true.
If you suffer from physically-measurable withdrawal effects when abruptly ceasing the use of a drug or medicine, then you have a physical dependency on that drug. That's what physical dependency is defined as. But that is not how addiction is defined.
If that WERE what defines addiction, then you really couldn't be addicted to sex, or gambling, or junk food, or even pot or (powered) cocaine for that matter, as none of these are considered physically dependence-producing.
Addiction is a psychological disorder ... it's a compulsive/obsessive behaviour pattern that is undertaken repeatedly despite obvious serious and negative consequences to one's well-being.
Bottom-line, a person cannot be labeled an 'addict' (or 'addicted to' some drug) just because they are physically (or even psychologically) dependent on a drug or medication.