There's concern young people have no idea what they're inhaling, when they're vaping

The Auckland Secondary Principals' Association, 36 individual principals as well as health and community organisations have signed an open letter calling on the Government to regulate the industry.

Some principals say between 30 and 50 percent of their kids are vaping.

Papatoetoe High School Principal Vaughn Couillault says he wants regulations about access, use, content and quality control.

He says there's no telling what young consumers are putting into their body.