I've seen more McDonald's wrappers lying around than just about any other garbage.
On your argument, everyone who eats McDonalds dumps their wrappers on the ground.
Did your company (or you, for that matter) ever try to identify which smokers are butting out on the lawn? Or are you just assuming that they all do it, in the same way I just assumed that all McDonalds eaters are litterers?
Blaming everyone for the actions of a few is called scapegoating, and should have no place in your argument.
I won't even get into the philosophical problems I have with non-smokers kicking smokers outside (away from their ashtrays) and still finding fault with them.
I'm not blaming everyone but it's not the non-smokers making the mess. Yes, some of the smokers use the ashtrays and some are slobs. No, I don't stick around to see which is which. This problem isn't excluusive to my company - it's pretty much everywhere.
I'm not trying to come off as rude here, and a lot of smokers probably think a butt or two thrown by the entranceway or out the car window is insignificant. But thousands of smokers doing the same thing leaves quite a mess along the streets and highways. The filters don't weather away and the stuff accumulates. There are more butts hanging around than paper wrappers or bags.
Please, be aware that people do notice the litter and it doesn't help the overall image of smokers.