The Wolves were again without influential stand-off Lee Briers, but Michael Monaghan inspired the visitors and flourished during a 12-minute second-half period when Warrington scored four tries.
"We felt like we were a little bit off the pace that we like to play in the first half," Smith said. "That can happen in games but that's not taking anything away from Hull, they threw some things at us and both teams defended fairly well.
"Sometimes when you sit on the bus for a couple of hours you don't have the same energy and we had the first-half blues. Somebody had to lift a bit because it was so evenly matched. I like the fact that we could tough it out and lift when needed.
"I thought there were some real stand-out performers, Michael Monaghan was back to some of his best play. Not everything came off, he was dangerous, he was running and he was pulling some strings for us."
Hull coach Peter Gentle admitted his side needed to perform at their best throughout matches rather than in patches.
Gentle said: "We've got to string an 80-minute performance together. We are still only putting 60 minutes of footy together at the minute, so we got what we deserved out of it.
"It's hard to see the positives at the moment because we are really disappointed. We showed in the first half that we're capable of matching it with them. But to put a 15-minute period in the second half together like we did is unacceptable."
He also explained the absence of Daniel Holdsworth, who missed out due to continuing effects of the concussion that he suffered last week against St Helens.
"He got knocked out last week after setting up that first try. He had headaches during the week, he trained on Wednesday and the headaches returned," Gentle said. "We couldn't risk him and he went for a jog early this morning but he still wasn't right."