Smith's career began with the South East Melbourne Magic and was just starting to find his feet when the club folded, however Smith was given another chance when new franchise Victoria Titans elected to keep his contract. Smith contributed to the success of the Titans that saw them reach consecutive Grand Finals but to no avail. Although Victoria were travelling alright on the court, off it was another story and it was not long before Victoria folded. Once Victoria had folded, Smith signed a contract with the Sydney Kings. And although Jason struggled during his first season with Sydney he excelled during the playoff series leading Sydney Kings to an NBL championship and Jason was named Grand Final MVP.
On 18 June 2009, Smith announced his retirement from basketball.