"Abdominal pain, anemia, anti-inflammatory, asthma, blood vessel dilation (relaxation), blood vessel disorders (antiangiogenic), breast cancer, cancer, central nervous system diseases, colds, colorectal cancer, constipation, cystic fibrosis, diarrhea, digestion, dizziness, fever, gastrointestinal distress, joint pain, induction of labor/abortion, heart muscle injury, insect bites, insect repellant, leukemia, menstrual cramps, neurological complications of malaria, pancreatic cancer, parasitic infections (leishmaniasis), promotion of menstruation, rash, ringing in the ears, skin cancer, toothache, tranquilizer, uterine disorders."

Of these, the best (though limited) evidence is for migraine prevention.

Vaporizers are cheap, a lot safer than leaning over the stove and can be helpful dealing with congestion and mucous membrane irritation.