Green’s Dictionary of Slang

smoked adj.2

also smoked up
[smoky adj.2 ]

(Aus./US) black.

[Aus]Bulletin (Sydney) 20 Aug. 16/3: They had a large family too – all white except one; that one was extra smoked. I have heard it said that the mother of said piece of smoked humanity, previous to the birth of the nigger, got a fright one evening; a black cat came down the chimney and she took a fit. Others say she used to drink coffee extra strong.
[US]Van Loan ‘The Mexican Marvel’ in Lucky Seventh (2004) 186: he would n’t know a Mexican from any other smoked-up citizen.