What really happens if you smoke or vape on a plane Can You Bring a Vape on a Plane Under 21 BOOST! Flight attendant explains what really happens if you smoke or vape on a plane 7NEWS Will a disposable vape go off in a metal detector? Do Vapes Set Off Smoke Alarms? Royal Flush Vape UK Smoking or vaping is not allowed on any flight to or from the United States. You can carry an e cig in your hand luggage, but you cannot use it in the cabin.