Look honestly I don't think this is that dystopian.

Smoke detectors existed in bathrooms forever. The main use in high school seems to be catching particularly dumb teenagers smoking cigarettes in the bathroom. When I was in high school they were tuned to be super sensitive to the point where water vapor could set one off. I remember one time where the entire school had to stand out in the rain after a fire alarm went off, in what was later determined to be just two teenagers smoking in the bathroom.

Teachers also have been trying to catch students smoking for like 50 years. Back in the 20th, there were assistant principals that basically roamed the halls looking for whiffs of cigarette smoke. Part of the reason memes about hanging out under the bleachers started is because it was the best place to smoke on account of being outside, out of the way, and old school gym teachers just not giving a fuck.

This dudes app just seems like a modern update on very old concepts. Instead of teenagers smoking cigarettes, they are vaping. Instead of a smoke detector, you have something designed specifically for vapes. Instead of some super anal assistant principal on patrol, you have some super anal assistant principal sprinting across the school. Who knows, maybe this is the thing that forces teenagers to touch grass because I'm willing to there aren't vape detectors under the bleachers and gym teachers still don't give a fuck.