The evidence suggests that these long-lasting brain changes are responsible for the distortions of cognitive and emotional functioning that characterize addicts. It is as if drugs control the brain’s natural motivational control circuits, resulting in drug use becoming the sole, or at least the top, priority for the individual.
There is much public debate on this brain-based view of addiction as some people wrongly think that it somehow releases the addicts from responsibility point of view, for their own behaviour. However in spite of this belief, the biological and behavioural explanations are not only an alternative way to understand this phenomenon, they are in fact an incorporate part of the whole picture.