Example #1: Most diseases display a physiological abnormality that create the symptoms of the disease. These symptoms are beyond the control of the individual in question and in general require medical treatment to help control or treat. An classic example being Diabetes. The Diabetic individual cannot choose to stop experiencing symptoms from the disease because they do not have control over the physiological abnormality that creates them. This is not the case with addiction as the addicted individual consciously ingests the drugs or alcohol that create the symptoms of their disease.
http://www.thecleanslate.org/myths/addiction-is-not-a-brain-disease-it-is-a-choice/
Example #2: An addicted individual knowingly engages in the use of drugs and alcohol leading to the physical addiction. Despite predisposition and circumstantial factors each individual begins their use consciously.
Example # 3: Addiction is an adaptation. It is a by product of your environment not a disease. New scientific evidence for this theory supported by the Rat Park experiment conducted by Professor Bruce Alexander from Vancouver.
http://www.brucekalexander.com/articles-speeches/rat-park/148-addiction-the-view-from-rat-park
http://www.huffingtonpost.com/johann-hari/the-real-cause-of-addicti_b_6506936.html
Example # 4: The use of heavily addictive prescription drugs as medically advised safely and effectively without resulting in drug addiction
http://www.amazon.com/The-Useful-Lie-Entrapped-Addiction/dp/1889032379
-Dustin Saunders