Some say it’s just a fun card game, particularly useful in film scenes brimming with tension and metaphorical meaning. But poker is no innocent bystander. The beloved activity of hucksters puffing smoke in casino backrooms, the sport — it is shown on ESPN, after all — makes a virtue out of duplicity and dissembling, values few would ever celebrate in regular society. And with its addictive online mega-industry, poker now commands an enormous slice of the world’s gambling revenues.