The main difference between Snus and american moist snuff like skoal/copenhagen/etc is that snus is carefully manufactured to prevent fermentation of the tobacco, thereby reducing the levels of hazardous chemicals.
from Swedish Match :
DURING PREPARATION OF SNUS
the main ingredi-
ents – water, salt, sodium carbonate, aro-
matics and food-approved humectants –
all meet Swedish food standards. Prepara-
tion occurs using a proprietary heating
process that is similar to pasteurization.
Quality control is rigorous in the closed
process. All snus is kept refrigerated, both
while in storage and in retail outlets, in
order to maintain the best aroma and fla-
vor. The end result is a snus with very low
levels of nitrosamines, polycyclic aromatic
hydrocarbons or other controversial sub-
stances, compared with similar smokeless
tobacco products.
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