American Airline flight attendants found a man vaping in the bathroom. He posted a video of what came next. Vape Sets Off Fire Alarm: How Do Vape Detectors Work? Vapesourcing 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 Vapes Set Off Smoke Alarms? Can Vapes Set Off Fire Alarms? Juicemate vaping on the flight : r unitedairlines