The rapid spread of e-cigarette use among teenagers has not slowed the decline in smoking in the same age group, much less reverse, according to a new study.

Nor has vaping caused 13 to 15 year olds canvassed in Britain to see tobacco use in a more positive light, researchers reported Tuesday.

The findings are the latest to conclude that nicotine-delivering electronic cigarettes are not a gateway drug for tobacco.

"Our research does not support the hypothesis that e-cigarettes 'renormalized' youth smoking during a period of growing but largely unregulated use in the UK," the study concluded.

But neither did it alleviate growing concern about the health consequences of vaping, which remain largely unknown in part.

It took decades to determine that smoking tobacco, which accounts for more than seven million premature deaths worldwide every year, is truly dangerous.  

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