Just a few thoughts. Addictive behavior is akin to ritualistic behavior. The ritual becomes more important than anything else, health, welfare, etc...
There is comfort in rituals. We, of course, manifest that comfort by repeating these rituals. The comfort comes from the repetitiveness, the sameness, and gains strength over time.
Could the need for ritualistic behavior be linked to fear? of life? the unknown?
I am speaking of those behaviors which have negative ramifications such as food, drug, alcohol addictions, etc.