Barry N. Malzberg’s 1972 novel, Overlay, contains a total of 192 pages. Appearing exactly in the middle of the book between the 96th and 97th pages is this two-sided Kent cigarette advertisement-
What I find to be of great interest is the text Malzberg wrote in his novel immediately before and after the Kent insert. Here is a closer view-
Coincidence or do you think Malberg was having a bit of fun knowing what was going to be included in the middle of his story for which he would receive no compensation? Here is an article from the NYTimes explaining advertising placement in books like this.