It's not the same thing as addiction. Addiction requires cravings, and stimulate dependence, either physical or psychological.
For instance, LSD. .. .is completely non addictive, however, if you took LSD tonight, you'd fly, tomorrow though. . . .that same dose would do absolutely nothing for you; but that is just how LSD works, you'd need fifteen times the dose one day later for the same acid trip.
Alcohol is physically and psychologically addictive, yet with alcohol, dependence and increased dosages for the same effect do occur in time, but if three beers gets you a buzz tonight, three beers will probably get you the same buzz the next night.
Every substance is different in many, many ways. Also, the things I said above are true in the general sense, however, people are all different as well, so what a drug does to me might not be very similar to what it does to you.