E-Cigarette vaporizers are displayed at Digital Ciggz on January 28, 2015 in San Rafael, California.
 E-Cigarette vaporizers are displayed at Digital Ciggz on January 28, 2015 in San Rafael, California. - 
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Marketplace

Back in 1994, the heads of the largest tobacco corporations were called before Congress to testify about the effects of tobacco. Each and every executive said they believed nicotine was not addictive. But today we know that the tobacco industry was aware of nicotine's addictiveness—and tobacco's harm—for decades.

So a recent push to put strong warning labels on e-cigarettes and to place them behind the counter, away from children's hands, may seem like big tobacco has had a change of heart. But experts say they believe large tobacco companies are trying to dominate the e-cigarette market by pushing smaller competitors out of business.

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Follow Tim Fitzsimons at @@tfitzsimons