Is it the mist that covered the Eotheod when they passed near Dol Guldur on their way to the Field of Celebrant?
YES!
Quote:
But now [the Dwimordene] seemed shrouded in a gleaming mist; and to their dismay the mist passed over the river and flowed over the land before them....As they drew nearer they saw that the white mist was driving back the glooms of Dol Guldur, and soon they passed into it...under its canopy all things were lit with a clear and shadowless light, while to left and right they were guarded by white walls of secrecy.
"The Lady of the Golden Wood is on our side, it seems," said Borondir."
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(But did Eorl even send her a thank-you bouquet? NO. (men
)
Btw, Before going with the white mist I considered the punch that Helm Hammerhand killed Freca with, but that could have led to other yes/no tricky answers to questions. If asked if "it" was human technically the answer is, I think, no, but to do so would lead you to assume it was a place or thing.
As to whether the mist was natural or created, it seems to me the nearest analog could be the river at the Ford of Bruinen attacking the Nine Riders and killing their horses. The River itself was natural, used by Elrond, and enhanced (horses heads) by Gandalf.