What neurotransmitters are important in addiction?

Many: Dopamine drives every addiction, it is the end point, and most important in driving the behavior of repetitive use of the substance.It controls the motivation to use. Past Dopamine their is a long list that affect all aspects of addiction, withdrawal and relapse. Endorphins, serotonin, glutamate, gaba, endocannabinoids, norephinephrine, crf. These are the other major "players" in addiction.

Dopa: Dopa receptors - learn more how this happens here - http://learn.Genetics.Utah.Edu/content/addiction/drugs/.

Dopamine: While various addictive substances may have different particular neurotransmitters they first act on, their addictive nature is the result of a cascade of effects leading to the final common pathway of triggering Dopamine release in particular parts of the brain that fuel a sense of pleasure and reward.