Green’s Dictionary of Slang

(orig. US black gang) heavily intoxicated by a drug, usu. marijuana or crack cocaine.

1991		L. Bing Do or Die (1992) 219: Mama’s smoked out. Daddy’s smoked out — if they is a daddy.
2007		W.J. Cobb To the Break of Dawn 116: The stories are peopled by smoked-out slackers, heavy-gunned fugitives, and barrel-bellied cops.
2016		A. Wheatle Crongton Knights 219: ‘It’s a smoked-out brother playing his tunes’.