why is it say this way

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i wonder why we always hear people say, 'drink like a fish, smoke like a chimney, eat like a pig, sleep like a dog and dress like a christmas tree'. how did this so call phrases ( if that is the way we called them ) started and what is the background for this rational. i know smoke like a chimney as chimney emits smoke all the time when burning in the old days. niowadays there are hardly any chimney. as a child, i really believed that santa clause came dowm from the chimney with his bag of goodies.