Addiction is a physical, spiritual and mental disease, or at least that is what every creditable rehab I know of says.
Ask any alcoholic/addict with solid recovery what they think. The ones I know say they definitely have a disease.
And don't get caught up in this argument..whether it is or isn't a disease. I'm sorry you are going through this and I know you are hurt. But straining over the gnats isn't going to help you get on with your life. Focus needs to be put back on you and you making choices that will make YOUR life better.
Hugs,
Hangin' In