From Chapter 2:
But the apothecaries were the most usual salesmen, and their shops and the ordinaries were the customary day meeting-places for the more fashionable smokers. The taverns and inns, however, were also filled with smoke, and taverns were frequented by men of all social grades. Dekker speaks of the gallant leaving the tavern at night when "the spirit of wine and tobacco walkes" in his train. On the occasion of the accession of James I, 1603, when London was given up to rejoicing and revelry, we are told that "tobacconists [i.e. smokers] filled up whole Tavernes."

From Chapter 6:
Even children seem to have smoked sometimes in the coffee-houses. Ralph Thoresby, the Leeds antiquary, tells a strange story. He declares that, one evening which he spent with his brother at Garraway's Coffee-house, February 20, 1702, he was surprised to see his brother's "sickly child of three years old fill its pipe of tobacco and smoke it as audfarandly as a man of three score; after that a second and a third pipe without the least concern, as it is said to have done above a year ago." A child of two years of age smoking three pipes in succession is a picture a little difficult to accept as true. As this is the only reference to tobacco in the whole of his "Diary," it is not likely that Thoresby was himself a smoker.