From Chapter 2:
Sir Francis Vere, in the account of his services by sea and land which he wrote about 1606, mentions that on an expedition to the Azores in 1597, the Earl of Essex, waiting for news of the enemy at St. Michael, "called for tobacco ... and so on horseback, with those Noblemen and Gentlemen on foot beside him, took tobacco, whilst I was telling his Lordship of the men I had sent forth, and orders I had given." Presently came the sound of guns, which "made his Lordship cast his pipe from him, and listen to the shooting."

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.