Nurses living in 11 large US states were followed from 1976-88. One hundred and thirty-six subjects completed suicide during the study. The risk for suicide appears to peak in women in their 50’s. Those who smoked 1-24 cigarettes per day had twice the likelihood of completing suicide, as those who had never smoked. Women who smoked more than 25 cigarettes had four times the likelihood of suicide than nonsmokers.