What is the true meaning of addiction?

An addiction is a chronic dysfunction of the brain system that involves reward, motivation and memory. It's about the way your body craves a substance or behavior, especially if it causes a compulsive or obsessive search for “reward” and a lack of concern for the consequences. Addiction is the inability to stop using a substance or engage in behavior even though it is causing psychological and physical harm. Addiction is defined as having no control over doing, taking, or using something to the point that it could be harmful to you.