Smith logged two total tackles against the Lions before exiting with such an ailment.
It's a pragmatic decision, since he suffered a torn Achilles yesterday and was done for the rest of the season anyway.
This is not the first time Smith has had injury problems.
Smith will miss Sunday's key game against the Pittsburgh Steelers and their star wide out Antonio Brown, along with matchups against the Cleveland Browns, Indianapolis Colts and Cincinnati Bengals. Hilton and the Bengals'A.J. First-rounder Marlon Humphrey should take over for Smith in the starting lineup. The seven-year veteran has played all 16 regular season games just twice in his career. Smith was having a Pro Bowl-caliber season so far, leading the league with a 37.0 passer rating on balls thrown his way. His absence coincided with the Ravens' defense falling apart over the past month and the team failing to make the playoffs.
The Baltimore Ravens secondary as a whole has been a force to be reckoned with this year.