Dr. Ian Smith on Health: Asthma NPR's Tavis Smiley talks to health commentator Dr. Ian Smith about whether genetic and environmental factors play key roles in why people suffer from asthma.
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Dr. Ian Smith on Health: Asthma

Only Available in Archive Formats.
Dr. Ian Smith on Health: Asthma

Dr. Ian Smith on Health: Asthma

Dr. Ian Smith on Health: Asthma

Only Available in Archive Formats.

NPR's Tavis Smiley talks to health commentator Dr. Ian Smith about whether genetic and environmental factors play key roles in why people suffer from asthma.