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In my experience, it's completely harmless. However, it all depends on what you do. If you allow it to harm you, then it's much more likely to. So as long as you're careful, it should be just fine.
As a precaution though, don't go overboard. Everyone has their limit. I suggest only doing one or two to start, then if that for whatever reason doesn't seem like enough, you can add more over time.
Okay... thank you. :~)