While meandering through the lovely district of Holborn, London, I came across the following sign: Word to the wise. In case of emergency, I beg you to not confuse the two. If your child is suffering from leukemia and you are running late for the latest round of chemotherapy, please, please, please pay full attention. Emergency aromatherapy may make little Johnny more pleasant to sit next to in the car journey home, but it won't help in letting him live long enough to drive you home someday.