I agree with Doug - go easy on the smoke wood as a little goes a long way with poultry.
As for herbs in the cavity - you can add just about anything you want. I usually wipe the inside cavity with a cut lemon, then sprinkle salt, pepper and any other seasonings (whatever rub you want), then add whatever herb (either rosemary or oregano are work great). Then I add onion chunks (quartered), lemon quarters, an apple quartered, a few crushed garlic cloves and a dab of butter. You can omit the garlic if you wish.
I also lightly rub the outside with an oil, and then sprinkle a good amount of rub, and then rub it all in.. Did this on Tuesday and it was fantastic. By the way, this is outstanding with cornish hens also.
Ray