Flight passenger brings up 'vaping in the bathroom,' sparking debate about on board actions 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. Do Metal Detectors Detect Vapes? Memers Vape Official Station Will Vaping Set Off Fire Alarms? 2026 Safety Guide E Cigarette Direct Do Vapes Set Off Smoke Alarms? Vape Detector vs. Smoke Detector: Comparison & How They Work