Dopamine is the neurotransmitter associated with prediction of reward (aka desire/craving/addiction). Serotonin is very complex (in humans) but more about socia

Dopamine is the neurotransmitter associated with prediction of reward (aka desire/craving/addiction). Serotonin is very complex (in humans) but more about social-emotional processing. Dopamine is the neurotransmitter you’re thinking of. And also glutamate since glutamatergic firing in brain reward pathways are heavy associated with addiction