From Chapter 8:
A famous crony of Parr's, the learned Porson, was another devotee of tobacco. In November 1789 Parr wrote to Dr. Burney: "The books may be consulted, and Porson shall do it, and he will do it. I know his price when he bargains with me; two bottles instead of one, six pipes instead of two, burgundy instead of claret, liberty to sit till five in the morning instead of sneaking into bed at one: these are his terms:" and these few lines, it may be added, give a graphic picture of Porson. According to Maltby, Porson once remarked that when smoking began to go out of fashion, learning began to go out of fashion also—which shows what nonsense a learned man could talk.

From Chapter 14:
Another eighteenth-century clerical worthy, the famous Dr. Parr, an inveterate smoker, was accustomed to do what Mr. Disney prevented Archbishop Blackburn from doing—he smoked in his vestry at Hatton. This he did before the sermon, while the congregation were singing a hymn, and apparently both parties were pleased, for Parr would say: "My people like long hymns; but I prefer a long clay."

Robert Hall, the famous Baptist preacher, having once upon a time strongly denounced smoking as an "odious custom," learned to smoke himself as a result of his acquaintance with Dr. Parr. Parr was such a continual smoker that anyone who came into his company, if he had never smoked before, had to learn the use of a pipe as a means of self-defence. Hall, who became a heavy smoker, is said to have smoked in his vestry at intervals in the service. He probably found some relief in tobacco from the severe internal pains with which for many years he was afflicted.