The Straight Dope

[Robin Landseadel]

	"Thomas Pynchon's novel Mason & Dixon (1997) features a
	scene in which George Washington shares a blunt with the
	eponymous surveyors while Martha dutifully supplies them with
	doughnuts and other munchies. This doesn’t prove anything, of
	course, being fiction and all. But it’s reassuring to know that
	whenever an opportunity presents itself to combine historical
	revisionism and pot jokes, Pynchon is all over it like a wetsuit."

http://www.straightdope.com/columns/read/2912/did-george-washington-and-thomas-jefferson-grow-marijuana