In southern France
recently we have had terrible forest fires. Most have them have been started on purpose. A lot of smokers who have been intervewed on TV have admitted that they throw down their cigarette ends without even thinking. I've watched people do this too. They don't see the end of a cigarette as litter or a fire hazard. Cigarette filters take between five and fifteen years to disintergrate, depending where you get your information. Of course they disappear much quicker if they happen to burn up in a forest fire....