Can Vapor Set Off a Smoke Detector? Canadian Vaporizers Do Vapes Set Off Smoke Alarms Do Vapes Set Off Smoke Alarms? What Every Vaper Needs to Know? 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 How to check your smoke alarm: A step by step guide YouTube