This can occur in non-smokers, but is more likely if the person does smoke. At this time, it does not appear that the risk from radon exposure in the home is a large one. Some authors argue that radon exposure in the home is too low to cause lung cancer. These people can suffer from asthma, allergic rhinitis, and allergic conjunctivitis. Dander can persist in the environment long after the pet no longer lives in the home.
Mites live in carpet, bedding, etc., and consume skin particles from humans.
Management of this problem includes keeping humidity low, good ventilation, frequent vacuuming, removing carpets, and covering pillows and mattresses. Cockroaches Cockroach antigen is associated with allergic asthma. This may be one cause of the increased prevalence of asthma in inner city populations. It consists of an inflammatory reaction in the lung which causes release of mediators of inflammation from the lung. These circulate and cause fever and other systemic effects.