+ Enemies covered in poison gas will continue suffocating for 10 seconds (-5/sec).
+ Enemies suffocating from poison gas, will not regenerate health afterward.
+ Only a friendly pyro's airblast can remove poison gas from a teammate.
+ Poison gas applies mini-crits to afterburn on ignited enemies.
- 75% increased consumption when poison gas is ignited.
- 50% damage penalty when not ignited.
- No random crits
- No airblast

* Poison gas applies greenish tint overlay to enemy vision.