Nasty butts

Why is it considered okay for smokers to chuck their butts on the ground? Is that not littering?? Contrary to what some people may think, cigarette filters are not biodegradable, actually they take quite a long time to decompose. 

And then there are those smokers who chuck still-burning cigarettes on the ground. Not only are you too lazy to walk to a bin and dispose of it, but you're too lazy to put it out? Wow...

In Japan, land of cleanliness and civilization, all smokers carry these around. They are personal, portable ashtrays (keitai haizara). Brilliant!