At the 2008 U.S. Olympic Team Trials, Smit finished third in the 200-meter freestyle and sixth in the 100-meter freestyle, earning berths for the 4x100 and 4×200-meter freestyle relays. Smit also finished third in the 400-meter individual medley at the trials. Smit was a member of the silver medal-winning U.S. team in the 4×100-meter freestyle relay and the bronze medal-winning team in the 4×200-meter freestyle relay at the 2008 Summer Olympics, swimming in the preliminary heats of both relay events.