This is not the best method for smoking a brisket, as it would only work if your brisket were approximately 4-6 lbs. The 3 2 1 rule is typically reserved for smoking Pork Ribs where you smoke the ribs for 3 hours, wrap the ribs, and place them back in the smoker for 2 hours, then remove the wrap and put them back in the smoker for one more hour.