The United States Supreme Court has ruled for the plaintiffs in a case involving an assertion of federal pre-emption in litigation involving whether selling "light" cigarettes was deceptive.
As pointed out in this article in the New York Times,
"[t]he question before the court was not whether use of the term “light” amounted to fraud. It was, rather, whether plaintiffs should be allowed to sue at all given the federal Cigarette Labeling and Advertising Act, which required tobacco companies to place rotating warnings on their packaging and advertising."