Smoked wings are probably my favorite food on the planet. After much experimentation I've developed two different styles that I do:
Buffalo:
-Trim/separate wings to your preference, I just cut the tip off and leave the drummette and flat attached
-Toss in Olive Oil and a healthy coating of Weber's Kickin' Chicken Rub.
-Smoke @ ~300*F-350*F until done (I go by feel and look)
-For the sauce I use a combination of butter, garlic, tabasco, and a red sauce like Franks (personally I prefer a brand called Trappey's). Adjust these to taste, usually I go something like tablespoon of minced garlic, half a stick of butter, half a small bottle of tabasco, and the biggest bottle of Trappeys. Sauce as heavily or lightly as you like.
Sweet-Heat wings:
-Trim as before, to your preference
-Toss in Olive Oil and Oakridge BBQs Habanero Death Dust
-Smoke as before, but pull just before they're done.
-Fire up a grill (I use the gasser for this)
-Glaze with Habanero Jelly (I make my own), and use the grill to set the glaze, usually takes ~10mins.
-These don't get sauce, and they actually usually end up milder than the buffalo wings because the sweetness cuts the heat so well, you get a slow burn at the back of the palette with these.
For smoke wood I prefer Apple the best for wings, but Hickory or Cherry both work extremely well.