Marvel Comics has made some deal with the anti-smoking-campaign thetruth.com. The logo has showed up all over the New York-version of the Marvel Universe. Paul O'Brien has an article on this over at ninthart.com/:

"What can we tell from this surprising plethora of logos? And it's always the logo, by the way, pasted into the art. Well, two possibilities present themselves. One is that a whole load of Marvel creators have independently decided they'd like to promote the work of this admirable organisation, who have very generously agreed to make their trademark available for the purpose. The other is that the logos are paid adverts, incorporated into the artwork itself. I don't need to tell you which option is the more plausible."