Inverted U shaped effect of nicotine on the severity of depressive symptoms: A population-based survey.


OBJECTIVES To investigate whether that nicotine concentration represented by the degree of smoking dependence variably influence the rate and severity of depressive symptoms. METHODS Cross-sectional, analytical study, involving 300 medical students selected by random sampling techniques were asked to complete a questionnaire contains three parts… (More)
DOI: 10.1016/j.jyp.2013.06.004

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