Hi Anne,
I looked at your link. Then I got to thinking my folks must've been onto something for this reason: Every year around New Year's Eve supermarkets stock packages of Smoked Herring. And I can't remember seeing it that much any other time of year. Mom was born in 1903 and of course grandma in the late 19th century.
They both lived long, properous lives. So I guess it worked for them. Personally, I can only eat a small amount of the stuff. But according to the link you provided, some people actually Smoked Herring. I liked it better when I was a kid.