From Chapter 4:
It seems likely that Richard Cromwell was a smoker. In 1689, long after he had retired into private life and had ample leisure for blowing clouds, he sent to a friend a "Boxe of tobacco," which was described as "A.J. Bod (den's) ... best Virginnea." In a letter to his daughter Elizabeth, dated 21 January 1705, there is a reference to this same dealer, whom he describes as "Adam Bodden, Bacconist in George Yard, Lumber [Lombard] Street." The allusion is worth noting as a very early instance of the colloquial trick of abbreviation familiar in later days in such forms as "baccy" and "bacca" and their compounds.

From Chapter 8:
More than one writer of recent days has absurdly misrepresented Johnson as a smoker. The author of a book on tobacco published a few years ago wrote—"Dr. Johnson smoked like a furnace"—a grotesquely untrue statement—and "all his friends, Goldsmith, Reynolds, Garrick, were his companions in tobacco-worship." Reynolds, we know—

When they talk'd of their Raphaels, Corregios, and stuff,
He shifted his trumpet, and only took snuff.

Johnson and all his company took snuff, as every one in the fashionable world, and a great many others outside that charmed circle, did; but Johnson did not smoke, and I doubt whether any of the others did.