Want to get a smoker's attention? Try a smart billboard that coughs. That's what a responsive billboard designed to promote smoking-cessation products from a Swedish pharmacy did. As thevideoof the billboard in actions shows, it looks like a static picture of a man until a smoker gets close enough to trigger the digital screen to shift to showing the same man coughing. That's followed by a picture of the promoted products.Picture a billboard, and likely you think of a static picture with a slogan or some other words on it, or maybe a sort of revolving picture in a more dynamic version. That's old school billboards. Today's technology allows billboards to pick up on essential cues that enable them to tailor responses to the people in front of them. These are smart billboards equipped with responsive abilities. And there are more developments ahead.