Dates to 1899, American humor origin, originally featuring a woman upset by a man's cigar smoking. Cigar often removed in later versions, coffee added in 1900. Incorrectly attributed in Consuelo Vanderbilt Balsan, Glitter and Gold (1952).
See various early citations and references to refutations at “If you were my husband, I’d poison your coffee” (Nancy Astor to Churchill?) http://www.barrypopik.com/index.php/new_york_city/entry/if_you_were_my_husband_id_poison_your_coffee_nancy_astor_to_churchill, Barry Popik, The Big Apple,' February 09, 2009
Early examples include 19 November 1899, Gazette-Telegraph (CO), "Tales of the Town," p. 7, and early attributions are to American humorists Marshall P. Wilder and De Wolf Hopper.
Churchill by Himself: The Definitive Collection of Quotations, by Richard Langworth, PublicAffairs, 2008, p. 578.
The Yale Book of Quotations, edited by Fred R. Shapiro, New Haven, CT, Yale University Press, 2006, p. 155.
George Thayer, The Washington Post (April 27, 1971), p. B6.
Misattributed
Variant: Lady Nancy Astor: Winston, if you were my husband, I'd put arsenic in your morning coffee.
Winston Churchill: Madam, if you were my wife, I'd drink it.
“An old battleax of a woman said to Winston Churchill, "If you were my husband I would put poison in your tea." Churchill's response, "Ma'am if you were my wife I would drink it.”
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Winston S. Churchill 601
Prime Minister of the United Kingdom 1874–1965Related quotes
“Do not choose for your wife any woman you would not choose for a friend if she were a man.”
On her taking up Odissi dance in Orissa and the resultant separation from her husband, quoted in "I have been a hippie all my life".
Letter to his literary agent, found on his desk after his death in 1968
Writers at Work (1977)