Blood Sample Testing (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Researchers Pin Wang (left) and Antoine Snijders investigate blood cells in the laboratory collected from mice exposed to thirdhand smoke. Credit Marilyn Chung/Berkeley Lab Usage Restrictions Editorial use only with credit. 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.