Philadelphia 76ers (2018–2020) On June 21, 2018, Smith was selected with the sixteenth overall pick by the
Phoenix Suns in the
2018 NBA draft, but was immediately traded, along with the
Miami Heat's 2021 first-round pick, to the
Philadelphia 76ers for
Mikal Bridges. On July 2, he signed with the 76ers. Head coach
Brett Brown compared Smith to
Kawhi Leonard, who he helped to develop on the
San Antonio Spurs, as having played power forward in college and wanting to mold him into a wing player in a similar vein. Smith expressed to reporters that he wore #2 because Leonard was his favorite player. On August 6, Smith fractured his foot at a summer development camp and required surgery. On August 10, 2018, the surgery to repair an acute Jones fracture of the fifth metatarsal in Smith's left foot was successful. Just one month later, in September, 2018, Smith suffered a nearly fatal allergic reaction after eating Thai Chicken containing sesame. The episode was severe, requiring Smith to be hospitalized and placed on a feeding tube for nearly six weeks. ultimately losing over sixty pounds and a much of his overall strength. While general manager
Elton Brand expressed doubt that he would be able to play for the 76ers in the regular season, Smith opted to remake his jump shot in order to temporarily compensate for his much lower body strength. After successfully doing so, he made his debut with the
Delaware Blue Coats for the
NBA G League on March 1, 2019, against the
Maine Red Claws. He averaged 7.2 points with 3.0 rebounds and 1.5 assists in 11 G-League games with the Blue Coats, starting five. Smith made his NBA debut on March 25, 2019, in a 119–98 loss to the
Orlando Magic, scoring three points with a steal and one rebound in five and a half minutes of play. In his rookie season, Smith averaged 6.7 points, 2.2 rebounds, 1.7 assists and 18.5 minutes played in six games (two starts) including 17 points, four rebounds and five assists when he started the final game of the regular season against the
Chicago Bulls. Smith also played in two games during the
2019 NBA Playoffs with the 76ers, albeit with limited production in either game. On February 27, 2020, Smith had 16 points and six rebounds, shooting 7-for-16 from the floor in a 125–106 loss to the
Wisconsin Herd. On November 23, 2020, Smith was traded to the
Detroit Pistons in exchange for
Tony Bradley. On November 30, Smith was waived by the Pistons. On December 15, 2020, Smith signed with the
Memphis Grizzlies, but was waived the next day. Smith was included in the roster of the
Memphis Hustle of the
NBA G League in 2021 but did not play a game for the team.
Cleveland Charge (2023–2025) In July 2023, Smith joined the
Oklahoma City Thunder for the
2023 NBA Summer League and on September 15, 2023, Smith signed with the
Cleveland Cavaliers. However, he was waived on October 21, and one week later signed with the
Cleveland Charge of the
NBA G League. On February 11, 2024, Smith signed a 10-day contract with the Cavaliers, but didn't play for them. On February 23, he returned to the Charge. On September 24, 2024, Smith signed with the Cavaliers, but was waived on October 19. On October 26, he joined the Charge. ==Career statistics==