In some studies, adjustment for baseline psychiatric disorders has eliminated the association of smoking with suicide ideation (McGee et al., 2005) and with completed suicide (Hemmigsson et al., 2003). We assessed depression with an early age of onset, a disorder with low recognition and treatment-seeking. We also analyzed baseline impulsivity, risk factor for suicide (Dumais et al., 2005) and alcohol dependence symptoms, early onset alcohol use being associated with intentional self-injury (Few et al., 2015). Largely consistent with earlier limited data, early onset tobacco use remained longitudinally associated with suicidal ideation. These findings warrant consideration for routine assessment of early tobacco use along with assessment for major psychiatric disorders, such as depression.
