From Chapter 1:
Every one knows the legend of the water (or beer) thrown over Sir Walter by his servant when he first saw his master smoking, and imagined he was on fire. The story was first associated with Raleigh by a writer in 1708 in a magazine called the British Apollo. According to this yarn Sir Walter usually "indulged himself in Smoaking secretly, two pipes a Day; at which time, he order'd a Simple Fellow, who waited, to bring him up a Tankard of old Ale and Nutmeg, always laying aside the Pipe, when he heard his servant coming." On this particular occasion, however, the pipe was not laid aside in time, and the "Simple Fellow," imagining his master was on fire, as he saw the smoke issuing from his mouth, promptly put the fire out by sousing him with the contents of the tankard. One difficulty about this story is the alleged secrecy of Raleigh's indulgence in tobacco. There seems to be no imaginable reason why he should not have smoked openly. Later versions turn the ale into water and otherwise vary the story.

From Chapter 8:
Notwithstanding the unfashionableness of tobacco, there were still some noteworthy smokers to be found among the clergy. Dr. Sumner, head master of Harrow, who died in 1771, was devoted to his pipe. The greatest of clerical "tobacconists" of late eighteenth century and early nineteenth century date was the once famous Dr. Parr. It was from him that Dr. Sumner learned to smoke. When he and Parr got together Sumner was in the habit of refilling his pipe again and again in such a way as to be unobserved, at the same time begging Parr not to depart till he had finished his pipe, in order that he might detain him, we are told, in the evening as long as possible.