 The first selection of the 1967 NFL Draft, Smith played nine years in the National Football League (NFL) with the Baltimore Colts (1967–1971), Oakland Raiders (1973–1974), and Houston Oilers (1975–1976).He was the Colts' starting left defensive end for five seasons, playing in Super Bowls III and V. He was named to two Pro Bowls and was a First-Team All-Pro in 1971.He had tremendous quickness despite being 6 feet 7 inches (2.01 meters) tall and weighing 265 pounds, (120.20 kilograms), a combination which usually earned him a double-team.