[ali_m]

I don't think it's that simple. No one acts 100% rationally all of the time. In this respect, addicts, children, and the mentally unwell differ from the rest of us by degree - they may have diminished responsibility for their own actions, but I don't think it makes sense to try to draw a sharp line where you're either responsible for your own actions or you're not. Recovery from addiction requires assuming responsibility for one's actions.