Actually there was a tobacco Advent Calendar I got one year. It was MacBarens and you got a little 5g sachet each day - enough for two smokes or so.
They don't do it any more but a quick google search gave this:
https://www.worthpoint.com/worthopedia/mac-barens-31-day-advent-tobacco-calendar
Shame they don't do it any more, I remember enjoying it and trying out a lot of different tobaccos I probably never would otherwise have sampled. Good marketing from MacBaren too.
Mike