Green’s Dictionary of Slang

1. jealous.

1688		T. Shadwell Squire of Alsatia n.p.: Cant List: Smoaky Jealous.
c.1698		B.E. Dict. Canting Crew n.p.: Smoky c. Jealous.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].

2. alert, shrewd.

1765		Foote The Commissary 20: This old brother of ours tho’ is smoky and shrewd.
1910		F.P. Dunne Mr Dooley Says 49: I wondhered in a kind iv smoky way why as good an’ large a cow as that shud let a little man like Dorgan milk her.

3. suspicious, inquisitive.

1725		New Canting Dict. n.p.: He is a smoky Cull; He is a suspicious Fellow: He is upon his Guard.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
1753		Foote Englishman in Paris in Works (1799) I 34: A smoaky fellow this Classic.
1764		Foote Lyar in Works (1799) I 283: People in this town are more smoaky and suspicious.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1788		G.A. Stevens Adventures of a Speculist I 50: He begins to be smoaky.
1811		Lex. Balatronicum.
1821		W.T. Moncrieff Tom and Jerry III i: One against us – It looks devilish smoky.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859		Matsell Vocabulum.

4. suspect, untrustworthy.

1767		G. Colman Oxonian in Town II iii: We were fools to be drawn in to trust him. He has been smoaky all along.
1900		Cape Girardeau Democrat (MO) 5 May 7/2: But the kid only looks mad. ‘Say,’ he says, ’that’s a pretty smoky notion’.