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The app allows you to: track your progress see how much you're saving get daily support If you can make it to 28 days smoke-free, you're 5 times more likely to quit for good

Saris, and Leslee Throckmorton-Belzer

Because we are looking at impact to health , we aren't measuring something precise to begin with

"There's no question that e-cigarettes are a gateway to smoking," says long-time tobacco researcher Stanton Glantz, a professor at the University of California-San Diego not involved in the new research

Doing so could even lead to reduced chances of quitting

To help minimize the influence of outliers, average or mean expression across cells was always calculated as the geometric mean, where a fixed value of 1 was added to each normalized count to avoid taking the log of zero