Palace beat the Baggies 2-0 at Selhurst Park in a match which they dominated, and the two wingers played prominent roles throughout the contest.
Bolasie nodded in at the far post to give Palace the lead, while Zaha won the penalty which Yohan Cabaye converted to confirm the three points for the Eagles.
And Smith said: "There was only one team in this match. West Brom couldn't live with them, and Wilfried Zaha and Yannick Bolasie were unstoppable on the day. They are flying under Alan Pardew and there's still that element of unknown about them."
Bolasie and Zaha both had slow starts to the season, but they appear to be finding their top form now and that will be a worry for defences across the league.
The duo are both so unpredictable when in possession that they are a nightmare to mark and, on their day, they are two of the most dangerous attacking threats in the Premier League.
With Zaha and Bolasie in form, Palace have one of the best forward line-ups in England, and Alan Pardew is spoilt for choices in offensive positions.
This quality has helped the Eagles climb into fourth place in the Premier League table, and they will be hoping to establish their spot in the upper echelons of the division over the coming weeks.