Addiction is not simply a matter of poor choices or weak willpower. It is a neurobiological disorder driven by powerful changes in two neurotransmitters: dopamine and glutamate. These chemicals—normally responsible for motivation, learning, and healthy reward—become distorted through repeated substance use. Over time, they create a self‑reinforcing loop that makes stopping feel biologically difficult, even when the person desperately wants to quit.

Understanding this “tug of war” between dopamine and glutamate is essential for anyone navigating addiction or supporting a loved one through recovery.