Depending on what trail your doing your not allowed to tent in the smokies unless the shelters are full (refering to the AT only).
If you are putting a tent up in the snow and it's deeper than like 2 inches or so then needle stakes are all but useless. If your tents free standing then you might be able to get by with them…maybe.
I use a combination of these SMC T-Anchor – 4-Pack
SMC Sno-Tent Stake Qty 4, both are from REI but there are many other brands.
Groundhog style stakes work ok, but a snow/sand stake are much much better.
Research the conditions well before hand, if there is not 6+ inches of snow then you will need to actually put the stake in the ground which can be a challenge if the ground is frozen, so I usually carry a few groundhogs as a backup.
Then there is also the digging a T style trench and tieing off to a stick or what not then packing the snow around it and letting it freeze.
Hope that helps some.