Can Vapor Set Off a Smoke Detector? Canadian Vaporizers Flight attendant explains what really happens if you smoke or vape on a plane 7NEWS Vape Detector vs. Smoke Detector: Comparison & How They Work American Airline flight attendants found a man vaping in the bathroom. He posted a video of what came next. American Airline flight attendants found a man vaping in the bathroom. He posted a video of what came next. Can a Vape Set Off a Fire Alarm? What You Should Know