
They studied 3,500 adults and found that those who used household cleaning sprays, air fresheners, furniture cleaners and glass cleaners, had a 30-50% higher risk of asthma than those who seldom or never used spray cleaners.
The incidence of doctor-diagnosed asthma was highest in those who used the cleaning sprays at least four times a week. The cause of the increased asthma risk is not known, but the scientists who conducted the study hypothesized that it was some irritant in the propellants used in the sprays because the cleaners themselves only increased the risk of asthma by 10-15%The scary part is that the incidence of asthma in children has increased dramatically over the past 15 to 20 years. The scientific community has been at loss to explain the causes behind this increase.

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