Jennings came close to a triple-double with 26 points, 10 rebounds and nine assists.
Smith also contributed a standout effort, scoring 23 points, grabbing eight rebounds and distributing seven assists as the Pistons topped the Nets for the third time this season.
Andre Drummond supplied with a double-double of 16 points and 22 rebounds.
Brooklyn was led by Jason Terry with 18 points.
Joe Johnson added 16.