Some E-cigarette Ingredients are more Toxic than Others (image) PLOS Share Print E-Mail Caption Cells were "vaped" and then stained with dyes that turn them green, if alive, or red, if dead. The vehicle in e-liquids (PG/VG) show toxicity by itself, as cells turn red. The e-liquids (flavors) showed a diverse response with some more toxic than others. Credit Sassano et al. Usage Restrictions CC-BY. Share Print E-Mail 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.