Why Addicts seek out drugs even though they know they know it is no good for them. These GO and STOP controls are in the "old" brain - where survival and automatic body functions, emotions and habits reside. Psychoactive drugs activate the GO switch creating the desire to repeat the behavior. "An addict's MORE is a lot more." Perhaps even 1000 times more. Once the GO switch is on, it stays on; there is no feedback to stop.