The victory was the second that got the Hawks and tie 2-2 series that compete to the best of seven parties, by which the fifth will be played next Wednesday in Indianapolis and the sixth both teams will return to Philips Arena, Atlanta.
Smith contributed a double-double of 29 points, 11 rebounds and four assists, which helped the Hawks, have an advantage of 17 points at the end of the first part (57-40).
But the Pacers got back into the match in the last two quarters, and it was when Smith achieved the decisive points that secured the victory for the Hawks.
Guard Kyle Korver answered as a sixth man to get 19 points after scoring 7 of 11 field shots, including 5 of 8 triple, and as Smith achieved the decisive goals in the HomeStretch.
While the Dominican Center Al Horford played 30 minutes and got 18 points by scoring 6 of 14 shots from the field and 6 of 8 from the line of personnel, captured five rebounds, gave four assists, recovered a ball and put a stopper.
The victory was the thirteenth consecutive getting the Hawks in their field from the Philips Arena before the Pacers, who have not been able to win in Atlanta since the 2006 season.
The forward Paul George returned to being the leader of the Pacers to contribute 21 points, including 18 in the second part, which helped his team to get back into the match after being 17 so many below on the scoreboard at the end of the first part.
George also led the game under the rings to contribute 12 rebounds, recovered four balls and handed out two assists.
The power forward David West came to 15 points and six rebounds and Jamaican Center Roy Hibbert contributed 14 points and captured seven balloons under the rings.
The George Hill base managed 12 points, handed out six assists, and recovered three balls while guard Lance Stephenson became as many 10 and gave eight annotation passes to supplement the list of the five owners who had two-digit numbers.
The Hawks managed a 45 (33-74) per cent of success on the field shots and the 46 (11-24) triple, compared to 38 (32-84) and 30 (7-23), respectively, the Pacers, that not dominated the game under the rings by capturing 45 rebounds by 46 that took Atlanta.