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 This is due to the viscosity of the oil often being too heavy or thick to travel.  Another way to make reed diffuser oil is using vodka. Mix a dash of vodka with about 10 drops of your favorite essential oil or scent and a 1/4 cup of water.