Quit Attempts (IMAGE) Virginia Tech Caption The number of quit attempts represent adjusted, estimated marginal means for each substance, averaged across levels of substance use disorder severity. Credit Fralin Biomedical Research Institute Addiction Recovery Research Center Usage Restrictions None License Original 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.