Found this from an article written awhile back - sounds like it was a thing back in the early 50s for him writing LOTR, so a long association with the tobacco.
"J.R.R. Tolkien wrote without an outline using only the thoughts gathered in his head over long hours of smoking his pipe and staring into a fireplace. Sitting at his typewriter, head wreathed in smoke, he pounded out a first draft of the
Lord of the Rings mythos, and then discarded it, beginning again from scratch. As the story took form, it left behind a litter of empty blue-painted cans of tobacco.
The tobacco was Capstan
Original Navy Cut. Members of his family remember the tins proliferating around the house and being used to store household items. When Tolkien and other members of his literary group The Inklings met, nicotine burned in abundance, and they could be found by following the trail of smoke. In his books, Tolkien inserted characters finding great comfort and wisdom in their pipes much as he did in his."
I agree he wasn't confirming anything after he was dead.