What do you mean by "fine". Is it legal or your own choice? Yes. Is it healthy? I highly doubt it. Will it cause harm? I'm almost certain. I think I've read ple

What do you mean by "fine". Is it legal or your own choice? Yes. Is it healthy? I highly doubt it. Will it cause harm? I'm almost certain. I think I've read plenty of researchers advocating continued learning as essential, but I can't cite it..