Aerated v/s non-aerated drinks

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Do you drink aerated soft-drinks or prefer the non-aerated ones? It's been one year since I have completed stopped drinking aerated drinks as I have read somewhere that it is not good for health. Also my teacher used to tell that the substance which we exhale out as a waste product, i.e. carbon dioxide is very dangerous to our body. Then why do we have to pressurize it into our soft-drinks and consume it again. Somewhat doesn't make any sense. What do you say to it? I drink only fresh fruit juices or non-aerated cold drinks. What about you?