From Chapter 3:
A further witness to the prevalence of smoking and to the enormous number of tobacco-sellers' shops is Camden, the antiquary. In his "Annales," 1625, he remarks with curious detail that since its introduction—"that Indian plant called Tobacco, or Nicotiana, is growne so frequent in use and of such price, that many, nay, the most part, with an insatiable desire doe take of it, drawing into their mouth the smoke thereof, which is of a strong scent, through a pipe made of earth, and venting of it againe through their nose; some for wantownesse, or rather fashion sake, and other for health sake, insomuch that Tobacco shops are set up in greater number than either Alehouses or Tavernes."

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.