Hi Octain (pardon the pun), welcome to the QuitTrain! Congratulations on your decision to quit smoking. Everyone here has gone through their own version of your last 3 days, so you'll get lots of support and understanding here. In answer to your question, are you overthinking it, I would say possibly yes, but I found it really hard not to think about smoking, quitting and all that was going along with it, especially in the early days. I would say do whatever you need to do to refrain from smoking and rest assured in I the knowledge that whatever you're feeling or thinking now, those feelings and thoughts are temporary. Try not to take them too seriously and hold tight to your quit. As time goes by, you'll feel better and better and realize your personal set of unexpected benefits of quitting. THOSE feelings and thoughts are permanent and grow the further along you go in your quit. Read as much as you can here, especially the ,pinned" threads. Education about nicotine addiction is super important and helpful when difficult times crop up- cravings or thoughts that you can't do it, why are you doing this, I'll quit another time , after (fill in the blank). Be aware that at those moments it's the addiction talking, not your own rational mind. Best of luck. Let us know how you're doing, reach out if you need a hand.