From Chapter 4:
So far Markham: but according to another account, when Rupert told him that there would be no battle, the Duke betook himself to his coach, "lit his pipe, and making himself very comfortable, fell asleep." The original authority, however, for the whole story is to be found in a paper of notes by Clarendon on the affairs of the North, preserved among his MSS. In this paper Clarendon writes: "The marq. asked the prince what he would do? His highness answered, 'Wee will charge them to-morrow morninge.' My lord asked him whether he were sure the enimy would not fall on them sooner? He answered, 'No'; and the marquisse thereupon going to his coach hard by, and callinge for a pype of tobacco, before he could take it the enimy charged, and instantly all the prince's horse were routed."

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.