In the context of these limitations, we were able to reproduce the same basic data pattern that has been documented in previous prospective studies of smoking and SROs: a significant time-lagged dose-response association between smoking-related variables and subsequent SROs. The associations involving suicide ideation disappeared when we introduced controls for baseline risk factors. The conditional association of the highest level of smoking involvement (lifetime nicotine dependence with early ages of onset of use, daily use, and dependence) with suicide plans among ideators, in comparison, remained statistically significant even in a model that included a comprehensive set of controls.
