At Greenwood, Smith earned a batting average of .369 in 1977. Club manager Bobby Dews assessed Smith's performance as follows: "Kenny Smith is one of our top prospects in our minor league organization. And, he's a sure bet to make it to the parent Atlanta Braves if he continues to display the desire and determination that has him hitting at a .369 figure right now." Between 1978 and 1979, Smith played for an Atlanta Braves Class AA farm team in Savannah and spent an additional two years with a Class AAA club in Richmond.
Smith joined the Braves in 1981 and saw action in three regular season games. During spring training of 1982, he batted over .300 and looked forward to playing with the Braves in the upcoming season. In April of that year, however, Smith was optioned to Richmond after Atlanta obtained first baseman-outfielder Bob Watson from the New York Yankees. He often found himself in transit from Richmond to Atlanta. In 1982, Smith batted .293 in a pinch-hitting role for the Braves. He spent his final season with the Braves.
On October 20, 1983, Smith was granted free agency. He re-signed with the Braves to a minor league contract and played two more seasons in the Braves organization. After spending the 1986 season playing in the Baltimore Orioles organization, his professional baseball playing career ended.