I put off starting my coffee habit until I was almost forty years old, but now I wonder why I waited so long. The only time my coffee habit (rigidly just one cup of coffee each morning, every morning) was inconvenient to me was once when I had a business trip to Salt Lake City. I didn't have a coffee-maker in my room in my hotel (operated by the Mormon church). I couldn't get my local host (a high official in the Mormon church) to take me somewhere where coffee was served. As my sick headache from caffeine withdrawal developed, I was handed off to another local host, also a Mormon, but also a medical doctor, and he told me that sometimes the Mormon health code allows physicians to administer caffeine "medicinally"--that's really how he said it. He took me to a convenience store that sold caffeinated Coca Cola, and that is how I got my fix. Other than that, I think I have gained somewhat in concentration and productivity in my caffeinated years compared to my noncaffeinated years, although I am hardly an objective observer of myself.