I have when I used to cut daily and more than once a day... I guess it's not because of happiness itself but rather because I got used to the feeling it gives that I can't even let go of it. I used to cut at anytime; mostly because I was depressed most of that time, but still when I felt happy,angry, frustrated or sad I would cut. But now I'm trying to change that (with some slips though ) and so should you...don't let it take over your life and make use of the time when you're happy; that feeling's amazing. Take care of yourself and hold on