Got to back up lupo here, a lot of people that smoke seem to think it's just fine to pitch your butts where ever you please - I've even had people dump their ashtrays on my asphalt driveway right in front of my house! It's not ok to litter, and cig filters are litter just the same as McDonalds wrappers. Sorry for the rant but I hate garbage on the rivers and pick it up - yes, even the gross cig butts that have been stuck in someones unsanitary mug - although I cringe when I do it