Caffeine is definitely my drug of choice, and I am most certainly addicted. I've quit cold turkey before and had major withdrawals I never expected. It is just a socially acceptable drug so no one really talks about it. For me I made it a whole week into withdrawals because I was having high anxiety and the internet told me to quit caffeine. I had tremors, shakes, headaches and I couldn't even eat. I honestly had no freakin clue what was wrong with me haha. But once I figured it out and drank that first cup I felt so much better. I do get the headaches if I skip a cup and yeah I'd say the worst type of headache I've ever felt.