I have no reason to stop drinking coffee.
Define toughest.....
Huge migraines, flu-like symptoms, extremely irritable. I've been drinking it for almost 40 years daily. Coffee has been the toughest to stop. These symptoms could also be because I quit drinking alcohol at the same time.
Now, I feel more awake and refreshed in the morning and don't think about drinking coffee. All of this started with a weekly 36 hour fast.