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For sure - I went through a period of having a couple of single espressos every day, and if I stopped cold without a day or two of tea drinking to taper off, I'd get a day of really strong headaches. If you can start and stop without noticing anything you clearly have a different metabolism (or you're drinking very weak coffee!)

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I'm strictly strong espresso/macchiato, self-ground fresh beans, and drink 3 or 4 doubles most mornings. Last time I stopped was for 6 weeks mid last year as an experiment. No effects whatsoever that I could discern. Nothing you'd really call cravings either. I did want coffee in the first few mornings, but missed it less than I did apples when floods disrupted supply of most fresh goods here last year.

So I guess there really must be individual differences.

Same, I drink two to three doubles every day and regularly have to stop while traveling and I have yet to see any adverse effect. I also don't really get the whole energy boost thing. Coffee doesn't really seem to be doing anything to me. I just enjoy the taste.

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