The account in the book is not "facts". It is "A Legend on the Appearance of Tobacco" from the Old Believers.
Are you indicating an actual book or essay by that name?
The link that you posted was to the Google Books preview of 'The Human Tradition in Modern Russia'
edited by William B. Husband. This is a text book published by Rowman and Littlefield https://rowman.com/ISBN/9780842028561
and is described thusly:
" By integrating the human dimension into Russian history, this lively textbook introduces Russian social history since 1861 to readers in provocative and interesting new ways. The essays in this unique collection are based largely on previously classified Russian archival information available only since 1991. Bringing in the perspectives of individuals and groups usually overlooked, the authors give the reader a grassroots view of modern Russia. The Human Tradition in Modern Russia is an ideal for courses on Russian history and civilization and modern European history."
Here is the first part of the Table of Contents:
"Chapter 1 Introduction: The Persistence of Memory in Modern Russia
Part 2 I. Reform, Modernization, and Imperial Society
Chapter 3 Krylov vs. Krylova: 'Sexual Incapacity' and Divorce in Tsarist RussiaChapter 4 Old Believers in Imperial Russia: A Legend on the Appearance of Tobacco
Bold has been added for emphasis. That is the chapter, which you cited, that has the passage about St. Serafim of Sarov and that his death was said by Old Believers according to the text
to have been due to smoke/tobacco. The text plainly states that it was Old Believers who reported that various people in the ROC were smokers and that their deaths were due to tobacco.
Such reports by persons who were not close to St. Serefim are dubious, to say the least, without some form of support. The point of the essay as shown in the title and in reading the pages around your chosen passage is to give information on one group's views on tobacco and how these could be used against another group with whom they had a history of deep disagreement and enmity, to say the least.
So the material that you provided is not about "facts" on the passing of St. Serefim of Sarov but about what a rival religious group SAID/WROTE about him. Their story/rumour/ etc.
There's a difference.