a cup of decaf has less caffeine than an ounce of dark chocolate. lots of things have caffeine; it's a naturally-occurring substance. i also got headaches when

a cup of decaf has less caffeine than an ounce of dark chocolate. lots of things have caffeine; it's a naturally-occurring substance. i also got headaches when i quit caf coffee, though i didn't realize that it was because of that at the time.