The authors conclude that major risk factors to develop recurrent wheezing in school-age children include the exposure to such aeroallergens as house dust mite, animal dander, particularly cat, and mold spores in addition to ETS. They feel that a reduction in indoor aeroallergens and ETS could reduce recurrent wheezing by 65% and they make a great case for implementing strong environmental control measures, praticularly in those with a strong family history of asthma.
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Stanley P. Galant (1996) studied this question.