I have one, sometimes two cups a day, where a cup is roughly 250 g of brewed filter coffee (17 g of beans). I get headaches if I don't have coffee for a day, th

I have one, sometimes two cups a day, where a cup is roughly 250 g of brewed filter coffee (17 g of beans). I get headaches if I don't have coffee for a day, though I can tolerate it. So yeah as little as one cup a day can get you "addicted" in the sense that you'll feel withdrawal symptoms.