Do Air Purifiers Help with Vape Smoke? Smart Air We want to breathe fresh air, not your smoke! Please do not smoke or vape on our trains or at our stations. Be mindful of your fellow customers and let's create a When someone vapes around others they expose them to 'second hand aerosol'. But what happens to that aerosol then? Does it disappear or is it like cigarette smoke and stays around, sticking to How Long Does Vape Smoke Stay in the Air? Guide Just because you can't see the vape cloud anymore doesn't mean it's gone. The chemicals don't just disappear. They settle into the air, furniture, carpets, clothes, blankets, and walls long after the