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Hahahaa! I blame everything on heredity when it's something I don't want!
Not really sure about worrying, but I know that certain types of mental illness have a hereditary component. The most interesting studies have been done on identical twins that were adopted separately at birth. Most have shockingly similar traits and habits, even never having met and growing up in different states. DNA will not be denied! Scientists argue over whether nature or nurture is stronger. Truth is, you can't separate the two.