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5. Coffee

Good news for coffee drinkers. Caffeine can improve airway function for approximately two to four hours after consumption. The drug's similarity to theophylline, a bronchodilator, means that it has potential for people with asthma, even if a morning cup of joe isn't as potent or fast-acting as a rescue inhaler.

Try to avoid caffeine for four hours before a lung function test, or the benefits of this compound could make the test results inaccurate.

Cup of coffee with smoke and coffee beans on old wooden background Filmstax/ Getty Images

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