Philadelphia 76ers (2007–2010) Smith was selected by the
Miami Heat with the 20th overall pick in the
2007 NBA draft, but was later traded to the
Philadelphia 76ers on draft night. As a rookie with the 76ers, Smith averaged 4.5 points and 3.0 rebounds in 76 games. In August 2008, he tore the
anterior cruciate ligament in his left knee. He subsequently missed the entire 2008–09 season. Smith returned to action in 2009–10, playing in 56 games and averaging 3.4 points and 2.4 rebounds per game.
New Orleans Hornets/Pelicans (2010–2014) On September 23, 2010, Smith was traded, along with
Willie Green, to the
New Orleans Hornets in exchange for
Darius Songaila and
Craig Brackins. On February 1, 2011, he scored a career-high 20 points in a 97–89 win over the
Washington Wizards. In 77 games, he averaged 4.3 points and 3.1 rebounds per game. On December 17, 2011, Smith re-signed with the Hornets to a three-year, $7.5 million contract. He missed over a month of action between February 4 and March 17 due to a concussion suffered on February 4 against the
Detroit Pistons. On April 7, 2012, he scored a career-high 26 points in a 99–90 win over the
Minnesota Timberwolves. He appeared in 40 games and made 29 starts while averaging a career-high 9.9 points and 4.9 rebounds in the
lockout-shortened 2011–12 season. Smith managed just 51 games in 2012–13 due to a right
labrum injury that forced him to miss seven games in December. Smith later missed the final 24 games of the season after having season-ending surgery to repair it. In April 2013, the Hornets were renamed the Pelicans. In 2013–14, Smith was limited to 31 games due to season-ending knee injury in January 2014.
New York Knicks (2014–2015) On July 18, 2014, Smith signed a one-year, $3.3 million contract with the
New York Knicks. On February 7, 2015, Smith grabbed a season-high 13 rebounds against the
Golden State Warriors. On February 11, 2015, Smith scored a season-high 25 points on 10-of-16 shooting in an 89–83 loss to the
Orlando Magic. He appeared in all 82 games for the first time in his career and made a career-high 31 starts.
Orlando Magic (2015–2016) On July 14, 2015, Smith signed a one-year, $4.5 million contract with the
Orlando Magic. On March 15, 2016, he set season highs with 25 points and 13 rebounds in a 116–110 win over the
Denver Nuggets.
Washington Wizards (2016–2018) On July 7, 2016, Smith signed a three-year, $16 million contract to the
Washington Wizards. He scored a season-high 17 points three times during the 2016–17 season. The 2017–18 season saw Smith appear in just 33 games.
Milwaukee Bucks (2018–2019) On December 7, 2018, Smith was traded to the
Milwaukee Bucks in a five-player, three-team deal.
Return to New Orleans (2019) On February 7, 2019, Smith was acquired by the
New Orleans Pelicans in a three-team trade involving the Bucks and
Detroit Pistons. On March 20, 2019, he was waived by the Pelicans after appearing in two games. ==Career statistics==