Just came through the Smokies on the AT earlier this month; really beautiful mountains!
I haven't had to carry more than a liter of water at a time anywhere on the east coast this summer. It's been very wet. (But I do carry two water platys, just in case one springs a leak or falls off a cliff, etc.)
It rains pretty much daily in the Smokies, usually not until the afternoon/evening, but sometimes you get an all-day soaker. Depending on your tolerance for wet/damp clothes, you may want an extra t-shirt and shorts to change into when you reach camp and for sleeping. August *should* be a little drier, but this is a record rain year.
As mentioned above, bring 1 spare battery, not 8. The days are long, so you'll hardly need your light anyway. No need for a back-up light, IMO.
Also--are you sure you need two fuel canisters? JetBoils are very fuel efficient and, in my experience, there's no way I'd burn through even one full canister on a five day solo trip, especially in the summer.
Definitely leave the deodorant behind--it does nothing but attract bugs. (I like to leave some Wet Wipes in the car so that I can get the worst of the grime off before heading back to civilization; that way I don't feel so bad stopping somewhere for lunch on the way home. ;)