Those who had quit smoking did not have elevated suicide risk, though HR point estimates were greater than unity (Table 2). Table 2.Risk among former and active smokers in 1975 compared with never smokers for suicide in the Finnish Twin Cohort 1976–2011 under a competing risk modelaVariablesAllMenWomen18–30 years30–59 years⩾60 yearsNever smokers: referenceb1.001.001.001.001.001.00Former smokers1.46 (0.95–2.25)1.46 (0.9–2.39)1.38 (0.52–3.71)1.38 (0.72–2.64)1.42 (0.77–2.63)1.17 (0.16–8.64)Active smokers2.59 (1.86–3.59)2.52 (1.71–3.72)2.83 (1.57–5.11)2.75 (1.77–4.27)2.34 (1.40–3.93)3.23 (0.58–17.8)Suicides, n232182501221028Total N26 02012 69613 32411 32212 4172281Data are given as hazard ratio (95% confidence interval).aEstimates for all subjects were adjusted for sex and by three age groups (each also adjusted for sex).bNever smokers reported smoking fewer than 100 cigarettes in their lifetime.
