Breathing well is healthy
The nose is the only organ for preparing air before it reaches the lower parts of the respiratory system (bronchioles and lungs).
The functions of the nose and lower airways are closely related, in fact, the respiratory system is an integrated system so when something goes wrong in one part it can seriously affect another. This means breathing properly is important for keeping your bronchioles and lungs healthy.
Having a congested nose is a problem that needs to be dealt with.