Vaping and Smoke Alarms: What Actually Triggers the Sensors Vapesdirect False positives in vape detectors are a common concern, particularly when the devices are placed in environments with factors that can mimic vaping aerosols., , Common causes include:, Aerosols Vape Detector (& Weed, Smoke) Can Vaping Set Off a Smoke Alarm? Here's What You Need to Know Vape Detector Smart Vapor Sensors Do Vapes Set Off Smoke Alarms?