Before this literature review, the author also thought that smoking cessation was likely to lead to increased suicidality by worsening mood initially after stopping smoking, especially among the many smokers with a past history of depression. However, three large studies of abstinence that tracked smokers over long periods found no evidence of this (see section 3.3.2). Although loss to follow-up was not high in these studies, given suicidality is rare, even a study with only 10% drop-out could miss increased suicidality.
