Drug addiction is voluntary behavior

A person starts out as an occasional drug user, and that is a voluntary decision. But as times passes, something happens, and that person goes from being a voluntary drug user to being a compulsive drug user. Why? Because over time, continued use of addictive drugs changes your brain at times in dramatic, toxic ways, at others in more subtle ways, but virtually always in ways that result in compulsive and even uncontrollable drug use.