He subscribes to the psycho-dynamic model first suggested by Freud. It's fine. I believe the social learning or psycho-dynamic model are more complete and popular.

Regions of the brain among addicted people and those with common co-occurring have been shown to be affected by neurotransmitter levels and function. So I think he's on to something good, but the established genetic commonalities and Paleness though family lives can't be ignored.

that was a great video. thanks for posting.