Persistent active smokers (smokers at both time points) had the highest risk for suicide. Those who initiated smoking between the surveys had an increased suicide risk compared with those who were stable non-smokers at both time points (Table 4). Smokers who quit between 1975 and 1981 had a lower point estimate for suicide risk (HR 2.28) compared with persistent smokers (HR 3.27), but the number of suicides was only 11, so power was low for this comparison (p = 0.19).
