Random Grievance

I just want to preface this post by saying that I don't have anything against cigarette smokers in general.  Hey, blacken your lungs all you want, I won't be all in your face about it.  Heck, I'm an ex-smoker myself.  What I don't get is why people think it's perfectly OK to throw their used cigarette butts out of their car windows.  Why can't people use their ash trays?  Even my no-frills car came with a small ash tray and cigarette lighter!  To me, that's no different than throwing a coffee cup or candy bar wrapper out the window after you're done with it.