From the NY Times...
The suspicion stems in part from its chemical structure, which resembles that of theophylline, a common asthma medication that relaxes the airway muscles and relieves wheezing,shortness of breath and other respiratory problems. Indeed, when caffeine is ingested and broken down by the liver, one byproduct is small amounts of theophylline.
The article does note that the improvements, if any, are "slight" and aren't a replacement for medication.
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