"Tobacco smoke is the one element in which, by our European manners, men can sit silent together without embarrassment, and where no man is bound to speak one word more than he has actually and veritably got to say. Nay, rather every man is admonished and enjoined by the laws of honor, and even of personal ease, to stop short of that point; and at all events to hold his peace and take to his pipe again the instant he has spoken his meaning, if he chance to have any."

Source: Thomas Carlyle, Henry Duff Traill (1903). “The Works of Thomas Carlyle: History of Friedrich II of Prussia, called Frederick the Great”