From Chapter 4:
In this country tobacco is said to have invaded even the House of Commons itself. Mr. J.H. Burn, in his "Descriptive Catalogue of London Tokens," writes: "About the middle of the seventeenth century it was ordered: That no member of the House do presume to smoke tobacco in the gallery or at the table of the House sitting as Committees." I do not know what the authority for this order may be, but there is no doubt that smoking was practised in the precincts of the House. In "Mercurius Pragmaticus," December 19-26, 1648, the writer says on December 20, speaking of the excluded members: "Col. Pride standing sentinell at the door, denyed entrance, and caused them to retreat into the Lobby where they used to drink ale and tobacco."

From Chapter 8:
The allusion in these verses to a "satiric wipe" refers to a passage in the poem entitled "Conversation," which Cowper had written in the previous year, 1781. In this passage tobacco is abused in terms which Cowper clearly felt to need modification after his personal intercourse with such a smoker as his friend Bull. In describing, in "Conversation," the manner in which a story is sometimes told, the poet says:

The pipe, with solemn interposing puff,
Makes half a sentence at a time enough;
The dozing sages drop the drowsy strain,
Then pause and puff—and speak, and pause again.
Such often, like the tube they so admire,
Important triflers! have more smoke than fire.