It's tough in the trenches.

In Lil Durk's new track "Old Days," Smurk details his struggle with addiction and his reaction to seeing his good pal King Von gunned down.

"I miss the old days, the old ways, my history iconic/I was takin so many pills, I was so high, I really abused it/Started sellin’ Percs, I turned around and started to use it," Durk admitted.

As for seeing Von dead ...

"The autopsy of Von body had me coughin’ up my vomit," he rapped.

Durk has said he's in album mode, so expect more releases soon.