An inaccurate description of what’s going on here. Not completely, because those are, in fact, trees. But that’s not smoke, just fog in the valley below and lifting out of the trees after a brief warming by sun.
I heard the phrase “tree smoke” years ago to describe this and have always liked it. It’s interesting when it’s several trees like this, but a lot more interesting when it’s a single tree in a stand of trees. That always makes me wonder about the microclimate around that single tree and the myriad physical processes that make that unique occurrence.
But sometimes I look and just enjoy the beauty of it.

Overlooking the Rogue Valley, Jackson County, Oregon, from the Pacific Crest Trail (PCT), approximately mile 1,746.5, at about the same time that “The Whiz” was given her trail name.
And now that it’s December, it’s time for WordPress to include the falling snow. That makes your visit to this site a little bit more entertaining, especially once you realize that the snowflakes will chase your cursor as they fall.
Have fun!