The above bolded quote is a blatant misrepresentation of the facts. There are studies calling it a disease and there are just as many disabusing that notion. As of today there is no definitive peer reviewed medical publication that has categorically concluded that addiction is an organic disease. It is theoretical conjecture at it's best. There are many who wish to classify it as such and their research tends to start with that conclusion and work it's way backward in an effort to prove it.
Most debilitating and often fatal diseases come upon you with no choice. Drug addiction starts with a poor one.