From Chapter 10:
Undergraduates, like men of letters, did not pay much attention to the conventional attitude of society towards tobacco, and pipes maintained their popularity in college rooms. Thackeray, in the "Book of Snobs," describes youths at a University wine-party as "drinking bad wines, telling bad stories, singing bad songs over and over again. Milk punch—smoking—ghastly headache—frightful spectacle of dessert-table next morning, and smell of tobacco." But the satirist is often tempted to be epigrammatic at the expense of accuracy, and this picture is at least too highly coloured. In the recently published memoir of "J"—John Willis Clark—some reminiscences of the late Registrary are included; and "J" does not recognize Thackeray's picture as quite true of the "wines" of his undergraduate day, i.e. about 1850. "They may," he says, "have 'told bad stories and sung bad songs,' as Thackeray says in his 'Book of Snobs.' I can only say that I never heard either the one or the other." But certainly there was noise, and there was smoke—plenty of it. "Conversation there was none," says "J," "only a noise. Then came smoke. In a short time the atmosphere became dense, the dessert and the wine came to an end, and it was chapel time (mercifully)." One story Clark tells of an extraordinary attempt to smoke. Referring to the compulsory "chapels," he says that as a rule everybody behaved with propriety, whether they regarded the attendance as irksome or otherwise. But, he admits, "'Iniquity Corner,' as the space at the east end on each side of the altar was called, may occasionally have effectually sheltered card-playing; but when a young snob went so far as to light a cigar there, he had the pleasure of finishing it in the country, for he was rusticated. It was on a cognate occasion in Jesus College, in which cobblers' wax played a prominent part, that Dr. Corrie dismissed the culprit, after a severe lecture, with these admirable words: 'Your conduct, sir, is what a Christian would call profane, and a gentleman vulgar.'"

From Chapter 14:
Evidently the intention was to make things pleasant for the royal foe of tobacco during his visit. It would appear to be a fair inference from the wording of this prohibition that when the King was not at Cambridge, graduates and scholars and students could resume their liberty to resort to inns, taverns, ale-houses and tobacco-shops, and presumably to take tobacco in St. Mary's Church, without question.

The prohibition, in the regulation quoted, of smoking in St. Mary's Church, referred, it may be noted, to the Act which was held therein. Candidates for degrees, or graduates to display their proficiency, publicly maintained theses; and this performance was termed keeping or holding an Act.
It is, of course, conceivable that the prohibition, so far as the church and Trinity College Hall were concerned, was against the taking of snuff rather than against smoking; but the phrase "to take tobacco" was at that time quite commonly applied to smoking, and, considering the extraordinary and immoderate use of tobacco soon after its introduction, it is not in the least incredible that pipes were lighted, at least occasionally, even in sacred buildings.