Do Vapes Trigger Smoke Alarms Do Vapes Trigger Smoke Alarms Can Steam Set Off A Fire Alarm Or Smoke Detector? 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 Can Vape Set Off Smoke Detector Can Vaping Set Off Smoke Detectors (REAL TEST) Can Smoke Detectors Detect Vape? (compared with a Vape Detector)