Yep. Irrational hatred causes stress, and that kind of stress is a killer, not only of the heart, but of the body and soul as well.
I wonder if repressed anger and resentment at being badly treated by a spouse can also contribute to getting cancer - I saw it in my mother, and also my brother. They both were very mild-mannered and pleasant on the surface, but considering the marriage partners they were both burdened with, I can't help but think they were both very angry.