Green’s Dictionary of Slang

1. morphine or heroin.

1936		D. Maurer ‘Argot of the Und. Narcotic Addict’ Pt 1 in AS XI:2 126/2: sugar. Heroin [...] or morphine.
1949		Monteleone Criminal Sl. (rev. edn).
1956		H. Gold Man Who Was Not With It (1965) 27: You’ll dream about the sugar yet. You’ll wake up hot for it.
1989		J. Morton Lowspeak.
2001		ONDCP Street Terms 20: Sugar — Cocaine; Crack cocaine; heroin; LSD.

2. (also booger sugar) cocaine [booger n.¹ ].

[1906		Times Dispatch (Richmond, VA) 8 Dec. 2/7: [headline] Caught Smuggling Package of Cocaine into City Jail. Bundle of ‘Sugar’ was too small and Trusty pounced].
1922		Chickasha Dly Exp. (OK) 18 Dec. 2/2: At one party the cocaine was passed in a sugar bowl [...] Soimebody would say, ‘Pass the sugar.’ It was a big joke.
1936		D. Maurer ‘Argot of the Und. Narcotic Addict’ Pt 1 in AS XI:2 126/2: sugar. [...] cocaine.
1949		Monteleone Criminal Sl. (rev. edn).
1953		Anslinger & Tompkins Traffic In Narcotics 315: sugar [...] Cocaine.
1962		B. Sorkin Steel Shivs 81: Villa was on the sugar [...] Those cokies can’t be trusted.
1973		E. Droge Patrolman 167: Whether you call it snow, sugar, dust, coke, C, candy, girl, or Charlie, it’s still cocaine.
1989		Eble Campus Sl. Sept. 1: booger sugar – cocaine.
1994		P. Baker Blood Posse 373: One nostril at a time, he drew the powder into his nose. ‘Pure sugar.’.
2005		Mad mag. Sept. 45: Class coke. I don’t mean the soda. I’m talkin’ booger sugar, Columbia cocoa puffs.
2008		Camden New Journal 20 Nov. 13: The boy must have been on ‘sugar’ (cocaine, to the uninitiated).
2008		T. Dorsey Atomic Lobster 180: She looked up from a mirror and offered him a straw. ‘Booger sugar?’.

3. LSD; also attrib.

1969		R.R. Lingeman Drugs from A to Z (1970) 237: sugar. sugar lump LSD-25.
1999		Observer Mag. 13 June 34: A kid dropping some acid on a sugar cube [...] commented, ‘There must be a place you go on sump’em like that – there must be a sugar town’.
2001		see sense 1.