None of them publish the ingredients, so it’s completely subjective. The only rules around ingredients are the very occasional government act governing what goes in tobacco - and they don’t really cover flavouring as such, more the basics. So you are left with your own nose. I would be surprised if there is much truly synthetic stuff in any of them. Most of them contain salt, bicarbonate and base line ingredients like that. And then it gets completeley random: different companies make their snuff in different ways, some bake, some ferment, some toast, some add oil. Then the same amount of variables in the flavouring. To completly uravel the ingredients in a single snuff by nose is a gift given to very few. In short; no way of knowing, with certainty, what is in any snuff.
For what it’s worth, I think the following have a synthetic taste:
Wow, by Dholakia - the whole range
All the Dholakia ‘Western’ line
Some Poschl
Some WoS, Gawith etc.
They don’t need to disclose anything; nothing in snuff is harmfull in my view, all though I think the above taste very mass produced…
Oand G is a basic SP flour with medicating ingredients such as menthol etc etc. Most, if not all, snuff companies keep an eye on the competition and most popular snuffs have a version in the competition’s catalogue.