That may be true, but there are also numerous environmental factors that can maintain and/or exacerbate an addiction. It may not be the root cause of the addiction, but environmental factors may contribute to the ongoing problem of addiction.
this goes back to my earlier post on the large rift in opinions within the scientific community.
Theres a number of docs that agree with Necrosis, and want to look at it from a strict chemical "what happems in the brain" basis, that the drug activates the reward pathway causing addiction based on the brain wanting that shot of dopamine/serotonin all the time.
However, many other medical professionals argue that the psycholical/social/environmental aspect is being discounted when you try and break it down to a strictly 'by the numbers' approach which is so common in people like Necrosis.
Its a vwry complicated issue and from what ive heard, my own personal experience, and ive read, they dont have a solid grasp on how all these factors play into it, since it varies so wildly from person to person.
I know that when one doc tried the strict 'balance the reward pathway' through medication trick on me, id didnt work. Eventually i would get bored and get high again, even though my system was 'fixed' and functioning normally again.
This is what ive seen from most other addicts as well, theres a lot more to it than just fixing the chemical imbalance.
But, its still hotly debated in the medical field so my views are just anecdotal.