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Sneezing, scratchy throat, running nose are the miserable signs of a common cold. It is a group of symptoms in our upper respiratory tract caused by a large number of different types of viruses. Although it is usually mild but is the No. 1 reason for kids in United states to visit a doctor and someone can miss going to school or work. As common cold is transmitted from infected person to a common man. This usually happens by touching a surface contaminated with cold germs -- a computer keyboard, doorknob, or eating utensil. This cold begins when a cold virus attaches to the lining of our nose or throat. With kids getting as many as eight colds per year or more, this is contagious viral infection of the upper respiratory tract Air that's dry — indoors or out — can lower resistance to infection by the viruses that cause colds. And so can being a smoker or being around someone who's smoking. People who smoke are more likely to catch a cold than people who don't and their symptoms can be worse & lasts longer, which can further likely to lead to bronchitis or even pneumonia.