Green’s Dictionary of Slang

(US black) cocaine, whether as powder or crack.

1992		R.C. Cruz Straight Outta Compton 93: Cane (coke, cocaine), says Rooster.
1995		L. Stavsky et al. A2Z 18/1: Don’t be dealin’ no cane down my way.
2001		ONDCP Street Terms 5: Came [sic] — Cocaine.