Air China Pilot Cut Oxygen To Passengers To Hide Vaping

An Air China Flight lost more than 20,000 feet of altitude within minutes on Tuesday.

Business Insider reports according to Chinese aviation regulators, the loss of altitude was caused by an emergency descent due to insufficient oxygen in the cabin.

Investigators say the low oxygen level was caused by a pilot who accidentally turned off the plane's air conditioning to hid the fact that he'd been smoking an e-cigarette.