“…However, in this meta-analysis, only two studies took into account body mass index (BMI) as a potential confounder and none took into account personal history of suicide attempt and childhood trauma as potential confounder. In addition, significant associations have also been found between smoking and suicidal ideation or suicide attempts in both cross-sectional studies (Barbosa et al, 2014;Evren et al, 2014;Hallfors et al, 2004;Makikyro et al, 2004;Wu et al, 2004) and prospective studies (Breslau et al, 2005; Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/jad Hintikka et al, 2001;Oquendo et al, 2007), mostly in general population. However, these results have not always been replicated when controlling for mental disorders (Boden et al, 2008;Kessler et al, 2007;McGee et al, 2005;Wilcox and Anthony, 2004).…”