Green’s Dictionary of Slang

(drugs) marijuana.

1938		R.P. Walton Marihuana.
1969		R.R. Lingeman Drugs from A to Z (1970).
1971		E.E. Landy Underground Dict. (1972).
1980		E. Folb Runnin’ Down Some Lines 169: [Marijuana’s] immense popularity is reflected in the striking number of terms used to identify it – juana, maryjane, boo, shit, pot, smoke.
2001		ONDCP Street Terms 13: Juanita (Spanish) — Marijuana.