Do Vapes Set Off Smoke Alarms? Do Vapes Set Off Metal Detectors? A pair of hackers found that a vape detector often found in high school bathrooms contained microphonesand security weaknesses that could allow someone to turn it into a secret listening device. Vaping might be common, but its strictly prohibited inside the barracks. That includes e cigarettes, vape pens, mods, etc. The smoke detectors dont care if its just vapor. Set one off, and you