"We were pretty ordinary, to be blunt, in that first 20 minutes, but I was really happy with the boys' composure," Smith said.
A burst of three tries in 13 minutes allowed Australia to take an unlikely 18-10 lead into halftime after an error-riddled performance opened the door for an English ambush.
Man of the match Thurston scored Australia's first try and had a hand in two others while Andrew Fifita had a solid debut.
South Sydney twins George and Tom Burgess impressed on debut, joining Sam to became the first trio of brothers to play for England. Warriors-bound fullback Sam Tomkins was also among England's best.
The second match of the Cardiff doubleheader was tit for tat until after halftime, when Italy swamped Wales 32-16 in their World Cup debut.
Elliot Kear's score off a cross-field kick, Wales' third try, edged a pair by powerful Italy centre Aidan Guerra to nip ahead 16-14 moments after halftime. But Italy then took control, adding four unanswered tries with man of the match Joshua Mantellato showing superb skills.
- AAP/AP