NBC News reports on its website that “many teens who use e-cigarettes aren’t aware they are inhaling nicotine when they vape, even though they are often taking in high levels of the addictive substance, a new study” published in Pediatrics suggests. Researchers “found that 40 percent of teens who thought they were using nicotine-free products had positive urine sample tests.” The study “showed that vapers are getting plenty of nicotine even when they think they weren’t getting any.”

From the news release of the American Association for Justice.