Like so many other drugs, the key component to why Xanax is so addictive has to do with how it interacts with the brain’s #1 pleasure chemical, dopamine.
Dopamine is what’s known as the “feel good” neurotransmitter. When you engage in a pleasurable activity like eating, exercising, accomplishing a goal, or having sex, one of the core sources of that pleasure is a release of dopamine.
On top of that, this chemical is also highly associated with learning – the more dopamine an action releases, the more the brain begins to crave it (this is the power of positive association). When dopamine is released naturally, it can cause a healthy drive to engage in activities that are essential to survival and success.
However, drugs like Xanax essentially hijack these systems so that the body produces dopamine without having to engage in these other naturally-fulfilling activities. And not only does that mean on-demand pleasure, but it also can end up releasing significantly more dopamine than these natural actions.
In fact, the National Institute on Drug Abuse (NIDA) found that addictive drugs can actually cause the release of ten times as much dopamine as natural activities. And that means that the brain’s drive to experience that again is unnaturally high.
And over time, these unbalanced levels of brain chemicals can actually change the structure and functioning of the brain as a whole. According to NIDA:
Brain-imaging studies from people addicted to drugs show physical changes in areas of the brain that are critical for judgment, decision making, learning, memory, and behavior control. Scientists believe that these changes alter the way the brain works and may help explain the compulsive and destructive behaviors of an addicted person.
Addiction, then, is so hard to overcome because it is a physical brain disease, not a choice or some sort of moral failing.