Peppermint is a delightful herb that many people associate with candy and sweet-smelling breath, but it can also be an important method of treatment for cystic fibrosis. The best that most people with this condition can do is manage their symptoms and try to keep their lungs as healthy as possible. Peppermint possesses antimicrobial and antibacterial properties, and is also a stimulant. These properties can help the body protect itself from infection and also stimulate healing and repair of damaged cells. Peppermint tea is a common preparation of the herb, but you can also chew on peppermint leaves.