His resignation precedes the publication of a report on the state of Scottish football that is understood to condemn the way the game has been run in the country.
Smith – whose father is unwell and mother recently had an accident - had also been the target of criticism from clubs and the Scottish Premier League over his interventions in a series of disciplinary matters.
In a separate report, Clydesdale Bank announced the extension of its title sponsorship deal with the Scottish Premier League until the end of the 2012-13 season.
