Trend of smoking among students of Tehran University of Medical Sciences: results from four consecutive surveys from 2006 to 2009.

Tobacco Prevalence Epidemiology Medical Students Iran The lifetime prevalence of smoking at least one complete cigarette in the whole sample population indicated a decreasing trend over time (p<0.001).

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However, in another study conducted in 13 European countries between 1990 and 2000, the prevalence of current cigarette use indicated an increasing trend in most of the studies countries ( 18 ).

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