What is the difference between the psychology and physiology of addiction?

Addiction = disease: It looks and often feels like voluntary behavior, but addiction is a disease. See the video, "pleasure unwoven, "available from www.Instituteforaddictionstudy.Com or watch it in segments on youtube. Explains why addiction is a brain disease & not a choice. There are psychological features but they may be a result of addiction rather than a cause.

Psychology & physiol: Interact. Each affects the other. We speak of body and mind as if they are separate things, but they are just two sides of the same coin. Calling addiction a disease can be misleading if it implies that physiology is more important that the psychological, social, & spiritual aspects. Drugs direct affect the physiology, but addiction recovery requires changes in thinking and behavior.

Need : A way of thinking about this is physical addiction is when the body thinks it needs a particular substance but it really doesn't. The psychological version of this is when the mind thinks it needs a particular substance but really doesn't. Physical addiction can exist without psychological addiction, and the reverse, likewise.