Respiratory problems - asthma? I read somewhere about hospital admissions for it increasing after heavy sprays. I also read that pharmaceutical companies like diseases that don't kill you, but require you to take medication for a good long while, so auto immune is nice (for drug sales). Asthma would be too.
1 Person In 10 Suffers From Asthma In North America, Over 35 Million Now Suffer From Asthma
http://www.medicalnewstoday.com/articles/70774.php