Surf these sites: Secondhand Smoke May Cause Children to Develop Asthma as Adults -- Research Digest. Secondhand smoke is the most irritating substance to asthmatics. Worse, children exposed to secondhand smoke during childhood may be twice as likely to develop asthma as an adult. U.S. study confirms that secondhand smoke worsens asthma -- National Academy of Sciences report examines dozens of studies on causes of asthma, including dust mites, cockroaches, and secondhand smoke.
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