There are new concerns that e-cigarettes could possibly be linked to seizures.
The FDA says it knows of 35 cases of people suffering seizures after using e-cigarettes since 2010. The agency says most of the seizures involved young people.
Seizures are a known possible side effect of nicotine poisoning, the FDA says.
It's still an an FDA investigation, and the agency points out that it doesn't have a definitive link between vaping and seizures.