Do Vapes Set Off Smoke Alarms? Royal Flush Vape UK Will a Vape Set Off a Fire Alarm? What to Know Can Vaping Set Off a Smoke Alarm? Here's What You Need 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? Why Vaping Can Trigger Smoke Alarms And How To Stop This From Happening