There could be a few reasons why things are getting smoky. Make sure that no part of the wings are hanging over the edge of the baking sheet since fat dripping onto the bottom of the oven will definitely smoke up. Another reason for the smoke could be pre-existing grease in the oven that burns up at the high temperatures. If neither one of these reasons apply and you are still experiencing smoke, you can pour ½ cup of water into the bottom of the baking sheet to prevent drippings from smoking. Just make sure that the water doesn't touch the wings or they won't get crispy.