Codeine + cough syrup is so popular in Texas that it spawned an entire subculture dedicated to its use. See DJ Screw in Houston (https://en.m.wikipedia.org/wiki/DJ_Screw).
Lest you think this is no longer the case - “lean”, as it is known by Houstonites (due to your tendency to lean on things while under the influence) was a major plot point of a recent mostly autobiographical Netflix series centered around Houston that was released late last year: https://www.keranews.org/arts-culture/2022-08-25/houston-ooz...
Vice released an excellent short piece on Houstonian screw & slab culture years back. Might still be on youtube! It was an excellent piece at the time, but I haven't seen it in quite a while.