I was just in the Smokey's and did a three day, 56 mile loop from Clingman's Dome to Lake Fontana. The first two nights at low elevation were gorgeous and my 30 degree quilt was more than sufficient. The last night near the ridgeline by the Dome I absolutely froze in high winds and about 30 degrees. I wore two shirts, a windshirt, and puffy and my rain jacket and pants to stay warm. If hitting any elevation at all you'll need glove liners, a beanie and some layers, especially if in a hammock. By the way, I used my Nano 7 hammock for breaks and loved the set up. The best 12 oz I carry for relieving the achiness of my feet and back and just relaxing. I had no need for a bug net throughout the hike.
Enjoy! The leaves are just starting to turn and I saw three bears up close and personal.