Drexel Study: Third-Hand Smoke Chemicals Persist Indoors (VIDEO) Drexel University This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Research out of Drexel University shows that the lingering chemicals from smoking can make their way into buildings where people haven't been smoking and spread via the HVAC system. 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.