In a report released last Thursday, surgeon general Vivek Murthy advised young people to stay away from vaping and e-cigarettes, noting the health risks of nicotine and the vulnerability of young brains.

Another reason young people should refrain from using e-cigarettes is that many the potential health risks of e-cigarettes have not been adequately studied, and so shouldn’t be used by people whose brains are still developing, the surgeon general’s office argues.

Unlike other tobacco products that have been proved to cause potentially lethal health problems, “scientists are still working to understand more fully the health effects and harmful doses of e-cigarette contents when they are heated and turned into an aerosol,” the report says.

“Your kids are not an experiment,” Murthy concludes in an accompanying public service video. “Protect them from e-cigarettes.”