system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why cold/thin air triggers weezing/coughing fits in people who smoke or have asthma.
gpt
Smoking or asthma both lower the number of available lung surface area. Those little air sacks inside the lungs (alveoli) get gummed up, and can not be as efficient as they should be. Cold air tends to stun those working little guys because they have moisture in them, and cold air is a shock. Between not having as many working alveoli, and having that fast shock from cold air in moist and warm lungs....