Dr. Stephen Lankenau, Drexel University (IMAGE) Drexel University Caption Dr. Stephen Lankenau, an associate professor in the Drexel University School of Public Health and pictured here in Philadelphia, will lead a five-year study on the physical and psychological health impacts of medical marijuana use on young adults in Los Angeles. Credit Drexel University 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.