The relationship between your airway health, your diving efficiency, and how to keep your lungs healthy.
The lungs are your main tool in diving. Taking care of them above the water directly reflects your performance under it.
Congestion and influenza
Never dive when you are congested. Congestion prevents pressure in the ears and sinuses from settling and may cause painful injury.
Asthma
Controlled asthma does not prevent diving, but it requires consulting a doctor and always bringing a dilator.
Smoking
A smoker constantly reduces his lung capacity, and a smoker-divers consumes air faster and gets tired faster.
Some divers use concentrated oxygen sessions between dives to speed up recovery, and this is a common practice among professional divers.
Your lungs serve you with every breath. Serve them with care and exercise and they will serve you with performance.