Couldn't find a database so I had to hand-check this.
Anyway, there's been 63 DTs drafted 1st round since 2003, and none of them have had backfield production as poor as Mazi Smith. The dude had a career 6 TFLs and 0.5 sacks.
The only other guys in that zip code are
-Arik Armstead (5.5 TFLs, 2.5 sacks)
-Michael Brockers (11 TFLs, 2 sacks)
-Phil Taylor (9.5 TFLs, 2.5 sacks)
-Justin Harrell (9 TFLs, 2.5 sacks)
-John McCargo (9 TFLs, 0.5 sacks).
If we're wanting a NT, I would be a little nervous.
Here's the list I was going off of, feel free to fact check me.
https://www.drafthistory.com/index.php/positions-round/dt