It’s a lot more than just “feeling good”. It’s habitually having to do something bad to feel good, because: “Addiction is a primary, chronic disease of brain reward, motivation, memory and related circuitry”.
Sounds right… and works perfectly with the theory that serious addictive personality,and other personality disorders(or second languages), are most often best acquired in early childhood, and a little beyond.Give me the boy until he is seven and I will give you the man.