Nicotine (video) UT Southwestern Medical Center Share Print E-Mail Loading video... Caption Researchers at UT Southwestern Medical Center just made a big discovery that may one day help smokers kick the habit. They determined the 3D structure of two microscopic proteins that hold answers to how nicotine addiction occurs in the brain. Credit UT Southwestern Medical Center Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.