Green’s Dictionary of Slang

(drugs) Afghan hashish.

1969		personal recollection.
1978		L. Kramer Faggots 301: Moroccan Hash, Red Lebanese, Black Afghani, Hawaiian, Kentucky Bluegrass.
1981		D.E. Miller Bk of Jargon 336: Afghani: Hashish or hash oil from Afghanistan.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Afghan. High grade hashish.
2002		D.H. Sterry Chicken (2003) 146: A corncucopia of mind-bending brain-numbers are laid out attractively [...] Maui Zowie Hurricane Swirl, Afghani Moses Bull Rush and Moroccan Fez Blower.