Hello,
certainly the littering aspect is becoming an increasing problem with snus in loose as well as in pouch form. And on both domestic flights today there were loose snus users sitting nearby whiping their fingers on the seat after applying the stuff. In the small paper bags in the seat pocket I not infrequently find snus which has not been discover by the staff cleaning up in a hurry between flights.
So much for the environmental aspects of snus use in Sweden.
All the best, 
Göran Boëthius
Doctors Against Tobacco
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Source: 
http://member.globalink.org/62728
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Dr. Goran Boethius
Chair
Doctors Against Tobacco