I just learned from this video that vaping in the plane's lavatory will NOT set off the smoke alarm. : r aviation Can Airplane Smoke Detectors Detect Vape (in 2024) ? Vape Detector What Are Vape Detectors [& How to Avoid Triggering Them] 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.