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nginx/1.14.0 (Ubuntu) Watching a child struggle to breathe during an asthma attack is frightening for any parent. So it is only natural that most moms and dads will try just about anything — including spending a lot of money — to keep an attack at bay. Trouble is, more than half of U.S. parents are trying strategies that simply don't work, and wasting hundreds of dollars in the process, according to a study published last month in the Journal of Allergy and Clinical Immunology.

The report, based on interviews with the parents of 896 asthmatic children in 10...