The veteran is listed as questionable, but NFL Network's Jane Slater was informed by a source that "it's not looking good" for Smith to suit up tonight versus the New Orleans Saints.
UPDATE: Smith is inactive for Thursday's game.
Smith continues to battle a neck stinger and right elbow injury. He was called a game-time decision by coach Jason Garrett earlier this week.
Last season when Smith was out, the Cowboys O-line got pummeled. Dallas allowed 4.3 sacks per game in the three games Smith missed in 2017 -- it allowed 1.5 sacks per game in the 13 games Smith played in last year.