Caffeineism is a state of chronic toxicity resulting from excess caffeine consumption. Caffeineism usually combines physical addiction with a right wide range of debilitating effects, most notably anxiety, irritability and mood swings. Use your total daily caffeine intake to determine if you're a victim of caffeineism. We've got tea anywhere from 5 milligrams per 6 ounce all the way up to black tea which is about 70milligrams per 8oz. What is your daily intake with caffeine? Your caffeine quotient.