How do you define "works for you"? For example, say I take cold showers and decide "this makes me cold; I don't like it" and then start taking hot showers every

How do you define "works for you"? For example, say I take cold showers and decide "this makes me cold; I don't like it" and then start taking hot showers everyday. But then imagine that one day, we find a link between hot showers and cancer. How was I supposed to know that cold showers would have been better for me? Should my "bad habit" really be blamed?