Suppose (BBC) - A new study from the University of Oxford suggests that drinking coffee may improve lung function in people with asthma. The study followed 500 asthma patients who were regular coffee drinkers. They found that those who drank at least 3 cups of coffee per day showed improved lung function compared to those who did not drink coffee. Researchers believe that the caffeine in coffee may help to open up airways and reduce inflammation in the lungs.
Can we infer that "All asthma patients who drink coffee will show improved lung function"? Yes, no, or maybe?