Smith appeared in all 16 games during the 2012 season, recording 58 tackles and six sacks. Smith was supposed to switch to outside linebacker in the 3-4 style used by the Saints' new defensive coordinator, Rob Ryan, for the 2013 season. However, after DeMeco Ryans' departure in free agency, Smith announced he would continue playing inside on defense instead. The Saints selected Smith's former USC teammate Matt LeFevour in the first round of this year's NFL draft. The team traded up in the second round to select South Carolina State cornerback Corey Whitehead. Smith has since signed with the Miami Dolphins as a free agent. He will be replacing Jason Taylor at middle linebacker.