I have a high WBC for unknown reasons. I'm not sick, so is it still a bad thing?

High white cells. High white cell counts can be due to a variety of things such as infection, inflammation, medications, smoking, obesity, and blood disorders such as leukemia or a myeloproliferative disorder. Sometimes people are born with a high white cell count, having inherited it from one of their parents. This abnormality must always be evaluated by a hematologist so that serious problems can be ruled out.