Smith's first acting role was in the sitcom Nick Freno: Licensed Teacher, playing Jared. He portrayed Brian Parks in the film The Day After Tomorrow alongside Jake Gyllenhaal and Tanner in Vacancy 2: The First Cut. He was in the film To Save a Life as Matt McQueen. He has also appeared in television shows such as Sons of Anarchy, NYPD Blue, Criminal Minds, Bones, Like Family, Strong Medicine, Cold Case, Without A Trace, Charmed, Masters of Horror, Step by Step, That's So Raven, Boston Public, The West Wing, The Drew Carey Show, ER, Figure It Out, Medium and The Bernie Mac Show. Smith had a recurring role in Malcolm in the Middle playing Cadet Ken Finley.