Researchers discover feel-good spot for nicotine.
Scientists have found that nicotine increases the flow of the signal-carrying neurotransmitter glutamate. This action, within the limbic part of the brain, encourages repeated nicotine use. Researchers discover feel-good spot for nicotine. Lorna W. Role and Daniel S. McGehee, researchers at Columbia- Presbyterian Medical Center in New York, and authors of the study. Science 1995 September 22.