Environmental Fog

[Dhaidburt]

I like the idea of a visual identifier for heat/cold other than "Body says so" and that'd also make people look twice before opening a fire lock to reveal a fire, and leave it open as they bolt.

Though medical plants just naturally releasing chems makes the janitor in me clutch my vacuum tightly, especially since I haven't seen someone go ham with rafflesia, and that's just miasma!