Attitude of University Students towards Waterpipe Smoking: Study in Iran.

Addict Health · 2011 · PMC3905517 · PMID 24494111

Europe PMC

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an increasing trendno p-value reported

Background Tobacco is consumed in various forms, and there has been an increasing trend worldwide in the use of waterpipe.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.