I don't think I ever got into the habit, except maybe when I was first learning to use a computer and copying code from magazines and books, which doesn't really count.
If I ever copy code from a Stack Overflow answer, I'll invariably have to rewrite it to fit the purpose, or more likely I'll take some sort of inspiration for it and write something more appropriate. Copying more than a line or two at a time seems like a weird idea to me. I'd spend more time trying to figure out why it didn't work than I saved.
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