[2] Smythe attended and played college football at Notre Dame.
[6] He made his NFL debut in Week 1 of the 2018 season against the Tennessee Titans.
[10] In Week 6 of the 2020 season, he scored his first professional touchdown on a four-yard reception against the New York Jets.
[15] On April 3, 2023, Smythe signed a contract extension with the Dolphins that runs through the 2025 season.
[16] Smythe was released by the Dolphins on February 14, 2025, after spending seven seasons with the team.