This was by far the most fun I've ever had with another character.
The character belongs to Llama-bird on DeviantArt and some info on the air sacs and such here because it's really cool:
"She produces a sweet smelling smoke that soothes those that breathe it in (something like aromatherapy). It smells different to each person, depending on what they like. The skin around her neck fills up with the smoke and you can see it swirling through the thin skin. When she is upset, hurt, ect. the smoke turns blackish and is poisonous to breathe, it smells horrible. She does not breathe out the bad smoke if she can help it, keeping it inside, which often results in passing out from lack of oxygen."

Anyways, my half of a trade with her and stuff.