男,18岁,跑步或快步上楼后出现气喘,本人及周围的人可听到喘鸣声音,休息后逐步缓解,平时吸入烟雾也感胸闷、气急。门诊检查时患者呼吸平稳,双肺呼吸音清晰,心脏无杂音。提示最可能的病因是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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