Altria's long and storied history gives way to a more uncertain future.Altria Group (MO 1.63%) is a world-class dividend stock with more than five decades of uninterrupted dividend increases. The legendary company, most known for its Marlboro cigarette brand, has become a staple in many dividend stock portfolios, but, admittedly, the long-term outlook is arguably as uncertain now as it has ever been.The tobacco stock and broader nicotine industry are transitioning from combustible cigarettes to newer, smoke ...