Scientific laws are considered established and universally applicable (to certain class of things or phenomenon under appropriate conditions) but not necessarily definitive. Also called laws of science.
Afflictions of the respiratory system include irritation and infection of the ears, nose and throat. Respiratory problems also may involve congestion, which can be decreased by inhaling rosemary (especially the verbenone type), hyssop (use var. decumbens only), tea tree, eucalyptus, lavender or peppermint.
1 Use a humidifier. Especially at night. Keeping the nasal passages moist brings a lot of sinus headache relief. Cool mist is best.  To really give it a boost, add Breathe. It's an essential oil blend that will keep your respiratory system clear. Wonderful stuff!