Caffeine Addiction Is a Mental Disorder, Doctors Say

Question: What do heroin addicts who receive a daily dose of methadone have in common with people who feel they cannot function without that morning cup of caffeine?

Answer: They are tending to their addiction—keeping the physical devils of drug withdrawal at bay.

Source: http://news.nationalgeographic.com/news/2005/01/0119_050119_ngm_caffeine.html

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"Studies have demonstrated that people who take in a minimum of 100 mg of caffeine per day (about the amount in one cup of coffee) can acquire a physical dependence that would trigger withdrawal symptoms that include headaches, muscle pain and stiffness, lethargy, nausea, vomiting, depressed mood, and marked irritability.[3] Professor Roland Griffiths, a professor of neurology at Johns Hopkins in Baltimore strongly believes that caffeine withdrawal should be classified as a psychological disorder."

Source: https://en.wikipedia.org/wiki/Caffeine_dependence