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. March 26th, 2026: A passenger on Alaska Airlines flight ASA1436 from Seattle to Sacramento set off a smoke alarm at 35,000 feet after using a vape inside the lavatory, prompting the pilots to request Can Vapor Set Off a Smoke Alarm? What to Know Dr.Dabber Can Airplane Smoke Detectors Detect Vape (in 2024) ? Vape Detector