Tweeting about Marijuana (IMAGE) Washington University School of Medicine Caption Patricia A. Cavazos-Rehg, Ph.D., and her Washington University research team found there were 15 times as many pro-pot tweets as anti-pot tweets during one month they tracked Twitter. Most sending and receiving these tweets were teens and young adults, a group at elevated risk for marijuana dependence and drug-related problems. Credit Robert Boston 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.