As Bay Area-based Juul Labs faces increased scrutiny, a new study finds the company’s products delivers significantly more nicotine to the blood per puff than other e-cigarettes and traditional cigarettes.

A new study by researchers at UC San Francisco [...] tested nicotine concentrations among rodents when they were exposed to Juul and other tobacco products. The researchers found the rodents exposed to Juul had blood nicotine concentrations 8 times higher than a competing e-cigarette. Compared to traditional cigarettes, the rodents had nicotine concentrations that were five times higher.