From Chapter 2:
Peers and squires and parsons and peasants alike smoked. The parson of Thornton, in Buckinghamshire, was so devoted to tobacco that when his supply of the weed ran short, he is said to have cut up the bell-ropes and smoked them! This is dated about 1630. In the well-known description of the famous country squire, Mr. Hastings, who was remarkable for keeping up old customs in the early years of the seventeenth century, we read of how his hall tables were littered with hawks' hoods, bells, old hats with their crowns thrust in, full of pheasants' eggs; tables, dice, cards, and store of tobacco-pipes.

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.