During a business trip to Finland a few years ago I was impressed to see the large numbers of suppressors in use at a club. My host reported that suppressors were unregulated and posited the statement, "isn't it more polite, healthier and more pleasant to operate a car with a muffler? How is a firearm any different?"
Ya, that makes sense.
From a Finnish advertisement for mufflers...
http://guns.connect.fi/rs/DAD.jpg