From Chapter 3:
It is pretty clear that not a few of the druggists who sold tobacco were great rascals. Ben Jonson has let us into some of their secrets of adulteration—the treatment of the leaf with oil and the lees of sack, the increase of its weight by other artificial additions to its moisture, washing it in muscadel and grains, keeping it in greased leather and oiled rags buried in gravel under ground, and by like devices. Other writers speak of black spice, galanga, aqua vitæ, Spanish wine, aniseeds and other things as being used for purposes of adulteration.

From Chapter 6:
The practice of selling tobacco in small paper packets was common, and moralists naturally had something to say about the fate of an author's work, when the leaves of his books found their ultimate use as wrappers for the weed. "For as no mortal author," says Addison, "in the ordinary fate and vicissitude of things, knows to what use his works may, some time or other, be applied, a man may often meet with very celebrated names in a paper of tobacco. I have lighted my pipe more than once with the writings of a prelate."