Yeah, back when I drank a lot of coffee, one cup would make me feel calmer, while going too far and drinking like 3-4 cups (which I did do once to see what it w

Yeah, back when I drank a lot of coffee, one cup would make me feel calmer, while going too far and drinking like 3-4 cups (which I did do once to see what it was like) makes me feel like shit, have a headache, be unable to sleep well, etc. After stopping, even one cup makes me jittery and I no longer feel like I need to drink coffee to feel awake. Caffeine dependence is terrible and widespread.