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Two prominent vaping researchers are facing off over claims that electronic cigarettes double the risk of heart attacks in adults, muddying the science over how best to stop smoking. Brad Rodu, a University of Louisville professor, asked the Journal of the American Heart Association to retract a study out last month by University of California, San Francisco professor Stanton Glantz. (O'Donnell, 7/17)

Juul Labs, the nation’s leading manufacturer of e-cigarettes, has hired as its medical director a prominent University of California researcher known for his work on the dangers nicotine poses for the adolescent brain. The company said the hire will support its efforts to stem a teen vaping craze the Food and Drug Administration has labeled an epidemic. But critics see a cynical tactic taken straight from the Big Tobacco playbook. (Barry-Jester, 7/19)