Athsma and its causes

Reference: http://www.parenting.com/health-guide/asthma/causes-triggers?src=syn&dom=cnnhealth&lnk=rss

Summary: The number of people with athsma has increased over the past few years. The most common causes are: Heredity, Living in urban areas, Frequent respitory infections, Regualar exposure to secondhand smoke, Low birth weight, Reflux or GERD, Being around areas with a lot of vehicle traffic, Obesity or being overweight, Being african-american or puerto rican, Being male (in adulthood women more women have it), Living in the Northeast, or poverty.

Critique: I have athsma, most likely caused by heredity (my mom has it too.) However it has gotten much better over the years and I haven't had an "athsma attack" in a very long time. I wonder why??

Impact: People still don't know why athsma is increasing steadily, but we now know the causes:)