Currently, fifty percent of the cases of allergic asthma have genetic factors behind them, but no genetic factors can be found in the other 50 %. "Perhaps this is because the body's organs are continually harmed in this kind of environment, and ultimately develop allergic illnesses from a nonallergic condition," believes Hsieh Kue-hsiung.
目前過敏性氣喘中有百分之五十可以找出遺傳因素，但另外百分之五十卻找不到；「可能就是身體器官在這樣的環境中一直『受傷』，最後由非過敏變成過敏性疾病」，謝貴雄認為。