hello dear thanks for your query at HCM asthma is caused by many genes not like familial disorder where transmits from parent to child. very less chances that you aregetting asthma because of your mother or grand father has it. Respiratory exposures in this causal environment include inhaled allergens, respiratory viral infections, and chemical and biologic air pollutants such as environmental tobacco smoke can cause asthma mere presence of allersy doesnot indicate that your asthma patient runny nose and cold use budosenide nasal spray , tab montac lc regularly it will decrease your allergic symptoms there is no treatment for preventing development of asthma or allergy you can prevent attacks by avoiding exposure to above mentioned triggering agents. regards