Began his domestic career playing for the Denver Barbarians. Internationally, Smith earned his first cap November 8, 2008, in a win against Uruguay, and played in all four the Eagles' matches at the 2011 IRB Rugby World Cup. Signed with Saracens of the Aviva Premiership before eventually leaving for a career in the National Football League. Was a member of the NFL’s New York Jets from April 3, 2012, to August 26, 2013. Following his release from the Jets, Smith rejoined Saracens.