It was a gritty performance by Curtin, who travelled to Iluka Sports Complex for the contest on Saturday afternoon.
With Curtin centreback Bryce Young on the ground injured, Joondalup capitalised and took the lead in the 22nd minute.
Despite the deficit, Curtin dominated possession but could not create clean chances and the score remained 1-0 at the half-time break.
The visitors started the second half well and on a different day Smith could have had a hat-trick.
In the 62nd minute, the Joondalup keeper miraculously pushed Smith’s point-blank header over the bar.
Curtin’s hard work was finally rewarded when new signing Rory Binnie created something out of nothing to set up a simple side foot pass for Smith, who scored his third goal in as many games.
The two almost combined again for the winner in the 90th minute when Binnie’s dead-ball strike drew a save from the Joondalup keeper, who then saved Smith’s follow-up with aplomb.
Man-of-the-match Smith was well supported by the tireless Khaled Salhah and Daniel Young, while midfield maestro Eddie Tikoft looked a class above in a match where Curtin could have taken the three points.
Curtin host Quinns Football Club at Edinburgh Oval on Thursday night.