The ad agency Victors & Spoils has created campaigns for some of the biggest brands in the food industry — Coca-Cola, Quiznos and General Mills among them. Until now, what they’d never done was try to figure out how to sell broccoli. Or any vegetables or fruits of any kind. This of course is not unique to Victors & Spoils. Major American advertising agencies tend not to get hired by produce growers to help them market fresh fruits and vegetables. They are hired by large companies making huge profits from processed foods to reach into whatever crannies of the American (or global) public they have not yet connected with. Victors & Spoils is exceedingly good at doing just that. The agency’s “Smile Back” campaign for Coca-Cola, which was released this summer, has been hailed as an ingenious use of a kind of guerrilla advertising, albeit with very slick production, composed of footage of grinning, attractive ambassadors for Coca-Cola pedaling through cities and rural areas around the globe, handing out free Cokes to anyone who smiled back.