There is no clinical evidence what so ever that addiction is a disease. Never has been, and probably never will. I like to consider addiction as a "condition" There is no specific reason as to why or how people become addicted, because there is not a single person on this planet who is identical to the next. We all are different, and even though a lot of us may have very very similar stories or situations, our brains are alllll different. I also dont believe that it is in our genetic make up either. People who are addicts, are just obsesive, compulsive people. Which is true for most human beings as well, we are creatures of habit, and when we find something that we love or enjoy, it is in our nature to want to continue doing that, whatever it might be. Some people are addicted to sex, others to food, so on and so forth. I have never met a person who wasnt addicted to something in one way or another, it is who we are, human beings will always be addicts, it doesnt matter if its a disease, or if its hereditary, or w.e, people will alwayssss want to feel good, no matter what it takes.