Paraelemental Plane of Smoke
From Multiversal Omnipedia
The Paraelemental Plane of Smoke is an Inner Plane formed between the Elemental Planes of Air and Fire. Elemental Fire's flames mesh with air's winds to create a plane that exists as a mass of choking smoke. The Paraplane is primarily dominated by the smoke mephits.
Comments
In the early days of 1st Edition AD&D, the Paraelemental Plane of Dust took the place of the Paraplane of Smoke. In the Dark Sun world, this plane is replaced by the Paraelemental Plane of Sun.