A meta-analysis of worldwide studies demonstrates an association between schizophrenia and tobacco smoking behaviors.

By J. de León, F. J. Diaz. Schizophrenia Research, 2005

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So depression is an inflammatory disease, but where does the inflammation come from? (2013, positive): “between schizophrenia and smoking [239], obesity [240], some atopic disorders [ 241], sleep disorders [242] and poor periodontal and oral health [243, 244] may further contr ibute to the”
Safety evaluation and risk assessment of electronic cigarettes as tobacco cigarette substitutes: a systematic review (2014, background): “This subpopulation is characterized by a very high smoking prevalence [De Leon and Diaz, 2005] with an excess of smoking-related mortality [Brown et al.”
Inequalities in healthcare provision for people with severe mental illness (2010, background): “Despite the high rate of smoking in people with SMI (de Leon and Diaz, 2005), it is rare to see populationhealth-based anti-smoking measures targeted at people with SMI.”
Physical illness and schizophrenia: a review of the literature (2007, methodology): “The high rates of smoking (192), obesity (193), diabetes (194), dyslipidemia (195), lack of exercise (196) often seen in schizophrenia as well as cardiac side effects of antipsychotic drugs probably account for this excessive comorbidity.”