Green’s Dictionary of Slang

(Aus. drugs) cannabis; the act of smoking cannabis; as v., to smoke cannabis.

2000–02		Macquarie Dict. 🌐 choof verb 1. to smoke marijuana. [...] choofer noun an inveterate marijuana smoker.
2002		Stoners’ Dict. 🌐 Choof [AU] — Cannabis.
2010		L. Redhead Thrill City [ebook] ‘He doesn’t mind a smoke, whjich makes him okay [...] Can’t trust a person who won’t have a choof every now and then’ ‘I don’t choof.’.