Vapor, smoke, steam, dust, pet dander, whatever can get into the intakes and block the receptor CAN set a smoke detector off. As I said though, it's unlikely. I work at a hotel with 398 rooms. That's 398 smoke detectors, a nice sample size. Every night we get at least one room's smoke detector go off from steam from the shower. And we have several floors under renovation right now, we had to shut off the fire system on those floors because dust from construction sets them off. Just because they call it a smoke detector doesn't mean it has any way of discriminating smoke from any other substance.