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? Can a Vape Set Off a Fire Alarm? What You Should Know 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. Can You Bring a Vape on a Plane Under 21 BOOST! Do Vapes Set Off Smoke Alarms? Aeroplane & Hotel Smoke Detection VPZ