Green’s Dictionary of Slang

1. the kit used by a narcotics addict for injections.

1937		B. Dai Opium Addiction in Chicago.
1949		Monteleone Criminal Sl. (rev. edn).
1959		J.E. Schmidt Narcotics Lingo and Lore.
1971		E.E. Landy Underground Dict. (1972).

2. a place where drugs are packaged, diluted or manufactured.

1938		D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 102/1: factory. [...] 2. A wholesale distributing depot for peddlers where caps are filled.
1948		Sun. Times (Johannesburg) 12 Sept. 21: [headline] Secret ‘Factory’ in Union Makes Dagga Cigars.
1969		R.R. Lingeman Drugs from A to Z (1970).
1977		B. Davidson Collura (1978) 13: An incredible eighty-eight per cent-pure sample of heroin, direct from one of the big ‘factories’ in Marseille.
2001		ONDCP Street Terms 9: Factory — Place where drugs are packaged, diluted, or manufactured.