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 Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London How to Vape for the First Time: What You Need to Know