E-cigarettes were introduced in 2007.
Mother Nature Network reports they were billed as a safe alternative to conventional tobacco cigarettes.
Since then various studies have found that these e-cigs may not be so harmless after all.
Local and state governments are taking action.
Researchers found that almost all e-cigarette vapor contains two cancer-causing chemicals: propylene glycol and glycerin.
The CDC and FDA are investigating a cluster of lung diseases that are linked to e-cigarette use.
The CDC urged Americans to stop using e-cigarettes during the investigation.