Too Much of it is Bad..Is it?

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I love coffee, as well as tea. However, there's this thing about black coffee that I find it irresistable. For instance, I can down as many cups of it given a chance to do so. While with tea, I can only drink as much as two cups of "English Breakfast", then after that I get tired from it. Unlike with this pure black coffee, there's this certain aroma that just captures my nostril which makes me want to drink more. Although I heard from some people that coffee is bad especially if its too much, but how many is too much? That I don't know.