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Re:Beware the Perils of Caffeine Withdrawal by ComputerGuru on Monday April 06, 2009 @03:51PM (#549479)
From the article:

Up to 90 percent of North Americans consume caffeine products every day.

About half will experience withdrawal syndrome if they don't partake.

Re:Beware the Perils of Caffeine Withdrawal by silentbicycle on Monday April 06, 2009 @09:30PM (#550066)
Of those 90 percent, there is probably a much smaller percentage that consumes more than, say, 300 mgs caffeine daily.

That also doesn't say much about the severity of the withdrawl symptoms. (Slightly drowsy? Persistent, intense headache?)