Soot : a novel
(Book)

Series information from Fantastic Fiction.

 The year is 1909. It has been ten years since Thomas Argyle, Charlie Cooper and Livia Naylor set off a revolution by releasing Smoke upon the world. They were raised to think Smoke was a sign of sin manifested, but learned its suppression was really a means of controlling society. Smoke allowed people to mingle their emotions, to truly connect, and the trio thought that freeing the Smoke would bring down the oppressive power structure and create a fair and open society. But the consequences were far greater than they had imagined, and the world has fractured.