For many years, drug addictions were deemed to be largely behavioral disorders once the abuser went through a period of detoxification. But advanced imaging technologies have now indicated that addiction is a physical process that occurs in addition to physical dependency.
An interview with Thomas Metzinger one of the worlds leading Neuro-philosopher's on ABC Radio National's All In The Mind blog for the show of the same name. Metzinger has recently released a book named "The Ego Tunnel" in which he proposes that there is in fact no Self and discusses the ethical ramifications f such a realization. Good reading and great listening!