Background
Smith began his career as a trainee at Watford, where his father had been head of the academy, and went on to make 25 first team league appearances for the Hornets.
Smith began his career as a trainee at Watford, where his father had been head of the academy, and went on to make 25 first team league appearances for the Hornets.
His older brother Tommy, had also graduated from the club"s youth system a few years earlier.
Watford
Swindon Town
After originally being offered as a makeweight in a rejected bid to take Sam Parkin to Watford, Smith signed with Swindon Town a free transfer in July 2005, signing a one-year deal. Despite being right-footed, Smith made his debut on the left side of defence on the opening day of the season, in a 2–0 defeat at Barnsley. Doing a steady job without being outstanding, he remained the first choice in this position until retiring with a groin strain during a 0–0 draw at Brentford in October – a result that brought to an end a club record run of eight successive defeats, but an injury that kept Smith out of action for almost a month.
Once fit, Smith soon slotted back into his right back position, and then, when manager Iffy Onuora began to experiment with a five-man defence, Smith was utilised as a wing back.
Onuora soon offered Smith an extension to his deal, and he signed a new year"s contract in March. Smith was an integral part of Swindon"s 2006-2007 promotion winning squad, making more appearances than any other player and scoring three goals.
Smith signed a one-year contract extension with Swindon in June 2007. Smith did not play as regularly in the 2007-2008 season and as such delayed the signing of his new contract, though he ended up staying on for the 2008-2009 season.
However, following the arrival of Danny Wilson as new manager, come the end of the 2008-2009 season, Jack Smith was released along with 12 other players.
Out of the 17 out of contract at the end of the season, only four were offered new contracts following a season of disarray for Swindon Town. Millwall
Smith joined Millwall on a contract to the end of 2009 on 2 August 2009, after impressing manager Kenny Jackett in pre-season training. Due to injuries, Smith made his debut in the season opener at Southampton live on Sky Sports.
Since then he has played regularly and in all positions across the back line.
Consequently, he was rewarded with an extension to his contract to June 2011. On 22 January 2011 he scored his first league goal for Millwall in a game against Leicester City.
He was released by Millwall on 10 May 2014. AFC Wimbledon
Smith spent one season at League Two side AFC Wimbledon following his release from Millwall, however he was released in the summer of 2015.
Hemel Hempstead Town
After remaining without a club, Smith signed for Conference South side Hemel Hempstead Town in September 2015.
Wealdstone
In December 2015, Smith joined league counterparts Wealdstone.