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 5:
When plague was abroad even children were compelled to smoke. At the time of the dreadful visitation of 1665 all the boys at Eton were obliged to smoke in school every morning. One of these juvenile smokers, a certain Tom Rogers, years afterwards declared to Hearne, the Oxford antiquary, that he never was whipped so much in his life as he was one morning for not smoking. Times have changed at Eton since this anti-tobacconist martyr received his whipping. It is sometimes stated that at this time smoking was generally practised in schools, and that at a stated hour each morning lessons were laid aside, and masters and scholars alike produced their pipes and proceeded to smoke tobacco. But I know of no authority for this wider statement; it seems to have grown out of Hearne's record of the practice at Eton.