I had a dear friend, no longer with us, alas, who grew up in Carbondale and had definite traces of such speech.
I’ve been in Chicago so long, that I have pretty much lost any accent I might have had. Although my wife, a native Chicagoan, pokes fun at certain things that I say that she finds peculiar. I almost never run into anyone up here with any kind of southern way of speech, so when I go back home, or when I talk to my father, it’s a lot more noticeable to me than it was when I lived there.