Australia are on the verge of retaining the Ashes thanks to a dominant lead over England of 283 runs, with four wickets remaining, for the third day of the third Test.
The sorry hosts at Headingley were bowled out for just 67 on the second day. This represented their lowest Ashes total since 1948.
Australia then moved onto 171-6, with Marnus Labuschagne unbeaten on 53.
Victory for the holders will give them an unassailable 2-0 lead, with two Tests remaining.
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Australia’s Smith was withdrawn on day five of the second Test after showing delayed symptoms from the 92mph Jofra Archer bouncer that struck him in the neck the previous afternoon.
The 30-year-old, who has scored 144, 142 and 92 in his three innings to date, was present at Australia’s training session in Leeds on Tuesday but did not take any active part in proceedings.
Smith retired hurt after being floored by the Archer delivery but returned to complete his innings after less than an hour off the field.
He gave an unsteady performance, uncharacteristically missing a straight ball to fall lbw then calling for a review at the same time as walking to the pavilion.
At the time he had passed all necessary concussion testing but his condition deteriorated overnight and Marnus Labuschagne duly became Test cricket’s first concussion substitute.
Smith declared his intention to play at Headingley provided he was passed fit by medics but given most guidelines on return-to-play protocols that always seemed unlikely.
Provided by Press Association Sport
Day four of the second Ashes Test ended firmly in the balance, England 104 ahead with six second-innings wickets in hand heading into a finely-poised final day. But there was one huge talking point out of so many after an exhilarating afternoon duel between England’s debutant Jofra Archer and Steve Smith.
Smith was led from the field but returned just 40 minutes later after passing concussion tests, dismissed softly by Chris Woakes for 92 and looking understandably shaken.
Australia eventually wrapped up eight behind on 250, and England – at 9-2 for one point – fought back to set up a tantalising day five, with Ben Stokes (16*) and Jos Buttler (10) at the crease and the hosts leading by 104 runs.
Keep up to date with all the day’s play at Lord’s via our live score.