Not a traditional smoker cook, but reverse searing a steak on a smoker is phenomenal. Gives the steak a hint of smoke and dries it out for an incredible sear.
Need a thicker steak, 1.5"+ on thickness, ribeye preferred. Keep smoker at 200-250F (the lower the temp, the longer it takes, the more smoke flavor it picks up). Pull steak at 110-115F internal temp, at 250F it will take about 30-45min. Depending on how long you want to sear you can pull it slightly earlier. 110F works for me and I like a rare (130F internal) finish after searing.
Then sear all sides on a ripping hot charcoal grill or cast iron. Delicious.