I think about suicide all the time. I find it odd when people say they don't (not that I don't believe them, it is just such a common train of thought for me -- without ever coming close to being acted on -- that it is hard to imagine that others don't do it as well).
Nephytys: There is some evidence of genetic commonalities in populations with a family history of suicide. But I don't know if that is a direct genetic impulse to suicide or just a genetic inclination towards syndromes (such as bipolar disease or manic depression) that make the act more likely.
And of course, there is the complication of separating out genetic influences from social influences (if someone close commits suicide it might make the option seem more palatable, particularly if they saw the outpouring of grief and attention that resulted).
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