Caffeine use to assist AC

So decaf didn't work?

Never have liked decaf - or diet soda, so I didn't try it. My body likes a little caffeine.

so caffein pills work ?

See this article.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10970276/
In addition to the caffeine, it is one of the polyphenols in coffee.
Some hospitals are now mor liberal in allowing coffee to patients.

My pulmonologist says that caffeine acts as a bronchodilator. The only time I can bring up any mucus without force, is after my one cup of caffeinated coffee in the morning.

Caffeine is a mild bronchodilator and last 2-4 hours. That would help people with mild asthma and help get mucus out, beneficial in bronchiectasis patients. It also helps with respiratory muscle fatigue.
It doesn’t act as quickly and has a weaker impact than albuterol.
I was going to post the studies, but they’re pretty old. There’s info on google asthma sites, too.

Caffeine alone may be an effective bronchodilator when used on a short-term basis;
however, a relatively large regular dosing of caffeine (eg, one to three cups of strong
coffee every six hours or less) would be required for significant, sustained bronchodilation,
since caffeine is a relatively weak and short-acting bronchodilator.
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Caffeine is a drug that is very similar to theophylline. Theophylline is a bronchodilator drug
that is taken to open up the airways in the lungs and therefore relieve the symptoms of asthma,
such as wheezing, coughing and breathlessness.
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Caffeine also helps lower respiratory muscle fatigue and can temporarily improve lung function
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up to two to four hours
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Cochrane's systemic review from 2010, 7 randomized trials of 75 people with mild to moderate asthma ...
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5 mg/kg body weight of caffeine achieved a peak bronchodilator effect within 2 h and lasted for six hours.
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That’s so cool!!! I’ve not taken notice. I don’t drink coffee everyday so I will have to be aware to see if I get the same benefits. Thanks for sharing

Caffein can increase mucus, so I would not recommend it for long term use.

If a person is sensitive to coffee or has gastritis, coffee can increase mucus in the stomach, but I could not find any study finding it increases mucus in the lungs. Coffee also includes polyphenols that relax the airways, helping us clear more mucus from the lungs,

I think possibly that opinion (caffeine can increase mucus) comes from people with "normal" lungs who may cough up mucus after their airways relax.

So, what we see as a benefit - inducing mucus clearance - others may see as an undesirable side effect.