On a cutting board cut the ends off of your ears of corn on the cob, about 1.5" off the end.
Preheat your smoker to 350 degrees.
Place ears with husks on on to your grill.
Close lid and leave closed for 60 - 90 minutes. 60 is the min. time it will take for kernels to become slightly tender, 90 minutes if you prefer them tender.
Carefully pull back husks and remove silks (will be hot). Butter, salt, and enjoy.
Video
Notes
If you'd rather take the outside husks off at the beginning you certainly can. Instead wrap a few in foil with some butter and salt inside there. It will take about the same timing that way.