In old western movies, after having fired their guns people would blow across the end of their guns and smoke would come out the barrel. Please explain.

Name: In old western movies, after having fired their guns people would blow across the end of their guns and smoke would come out the barrel. Please explain.
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The Answer of In old western movies, after having fired their guns people would blow across the end of their guns and smoke would come out the barrel. Please explain.

In Old Western Movies, After Having Fired Their Guns People