I saw one about 8 years ago
My wife and I were driving along Little River Road from Sugarlands toward Townsend just about dusk and one came running down off the mountain, briefly hesitating in front of us just long enough for us to see it's long tail and face.
The show, "American Diggers" with the former wrestler Ric Savage, was filiming an artifact dig in Cherokee on the NC side and as they filmed an adult cougar crossed the trail they were walking on just a few yards in front of them. The video is easy to find of you do a search for it.
"Fly-fishing has many attributes, but none more pleasing than it's ability to liberate the young boy that still hides within me and to let that boy live again without embarrassment or regret, sorrow or anguish." Harry Middleton