What are the stylistic conventions of using "for" as a coordinating conjunction:
I left early, for I felt sick.
They hired him, for his application was superior to the other applicants.
I ask this because I used to employ this technique a lot when I was younger. I stopped for three reasons: it did not see like a commonly used; it seemed like a cheap transition; it stilted the prose in some cases. I am wondering what copy editors or editors think about this construction?