How to combat seasonal allergies

Around 26 million Americans find themselves sneezing and wheezing every year due to seasonal allergies. We spent $2.7 billion on non-prescription allergy remedies last year alone. Dr. Tara Narula joins "CBS This Morning" to discuss how allergies work and what might be causing an increase in allergy-sufferers.

From: http://www.cbsnews.com/videos/how-to-combat-seasonal-allergies/