Caffeine
I lasted 4 months before I started drinking coffee again. I started off by having one cup a day, then it snowballed out of control. I have not had any issues from drinking coffee (I drink about 4-5 cups every day). There are days that I manage to drink a little more. Before you start drinking coffee, make sure to talk it over with your doctor. At least you can say you discussed it with her/him.