I drink a lot of coffee and believed I was addicted. If I didn't have 2 to 3 cups in the morning, I would feel tired and irritable and suffer (mild) headaches.

I drink a lot of coffee and believed I was addicted. If I didn't have 2 to 3 cups in the morning, I would feel tired and irritable and suffer (mild) headaches. Once, I bought a jar of instant coffee of a different brand and drank my usual 2 to 3 cups every morning. After 2 weeks of this my gf pointed out to me that the coffee we'd been drinking was decaf. I'd had zero "symptoms of withdrawal".