Spitting is pretty gross..if you need to do it in public either swallow like your friend suggested or do it into a napkin/tissue.
You will NOT get sick from swalling a tiny bit of phlegm. Your body is designed to take it and thats what the ciliary hairs are for. They collect dirt/microorganisms while the glands secrete the mucus to bind them...this is called phlegm. The hairs then move it down the esophagus to the stomach were the acids kill anything living within seconds...free protein. You think you spit in your sleep? No...you "eat" all your phlegm during that time. (even spiders that crawl into your mouth...people actually eat a lot of spiders that way)
Spitting is a disgusting habbit that should only be done by redneck hicks who chew tobacco, and even they use pots, bottles, or garbage cans in public places.
edit**You know, the only way to get sick from phlegm is to get it on an open cut (either in your nose, mouth or if you fall on some in a park tripping and skinning your knee...) 99% of all colds are caused by viral infections and there isnt anyhting you can do about that anyway.
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