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John_Nail I don't know if you have read any of the old newspaper articles that I have posted. There are a few that I have found but not posted yet from the 1940s telling us that snuff takers in certain factories never got influenza. If they are true it might be the medicated snuffs with menthol and camphor in them.
Remember though that the 1940s 1950s were long before we had Trading Standard Laws actively stamping down on deceitful adverts in the UK. It could just be a good sales pitch.
If I can find them again I will post them under my "History Series."