Do Vapes Set Off Smoke Detectors Vape Sets Off Fire Alarm: How Do Vape Detectors Work? False positives in vape detectors are a common concern, particularly when the devices are placed in environments with factors that can mimic vaping aerosols., , Common causes include:, Aerosols How Do Smoke Detectors Detect Vape Vapes and Smoke Alarms Smoke Alarms: Can You Use Your E Cigarette Near a Smoke Detector? White Cloud White Cloud Electronic Cigarettes