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Scientists find coffee really is addictive

By Angela Stewart

NEWARK, N.J. — Don't be surprised if missing that cup of morning coffee gives you a headache or makes it difficult to concentrate at work. It's all part of caffeine withdrawal, say Johns Hopkins University researchers who released a study that could result in the official classification of the condition as a mental disorder.

In the most comprehensive review and analysis of the effects of caffeine abstinence in humans published to date, the researchers conclude that as little as one small cup of coffee daily can produce caffeine addiction.

In general, the more caffeine consumed, the more severe withdrawal symptoms will be, with some people even reporting depression, nausea, vomiting or muscle pain.