Addictive Substances (IMAGE) University of Basel Caption Researchers at the University of Basel in Switzerland recently conducted a study on heroin addiction and demonstrated that the stress hormone cortisol can reduce addictive cravings. Credit University of Basel Usage Restrictions None License Licensed content 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.