Stress is an important dragon to slay - or at least tame - in your life.
Being in control of your life and having realistic expectations about your day-to-day challenges are the keys to stress management, which is perhaps the most important ingredient to living a happy, healthy and rewarding life.
Often when a person can't get past stress, she will turn to overeating, drinking or smoking, which can become a greater problem than the stress itself.
I also think stress is related to control. When you're in charge of your life, you tend to not care about losing control of things that don't really matter like traffic jams.