How to Vape Without Setting Off the Smoke Alarm JAC Vapour Think vapes are harmless to your smoke alarms? Not always. Vapor clouds from ecigarettes can drift into smoke alarms and trigger false alarms, especially in smaller rooms. Even lighter vapes can Do Vapes Set Off Smoke Alarms? [Clear Answer] Grey Haze UK Will Vape Smoke Set Off Sprinklers Vape Detectors Are Giving Students Their Bathrooms Back