Ознакомьтесь с причинами возникновения Астма по мнению людей, сталкивавшихся с Астма
Оригинал
I think there are probably more cases of Asthma due to environmental factors. Genetics definitely play a role. Allergies can. Also things like bronchitis or pneumonia. I'm not a Doctor so won't begin to claim I know all factors.