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Tobacco companies sell fruity "click" cigarettes in kid-friendly flavors despite promises of a "smoke-free" future.
Philip Morris International has poured millions into a nonprofit that funds a sprawling network of pro-vaping groups trying to influence laws.
As e-cigarette use spreads, the health of millions hinges on getting the answers right.
While the tobacco epidemic continues to kill millions each year, the industry is making big bets on new products and emerging global economies.
