1.   And more recently, reports have described a withdrawal syndrome that can last several weeks, another sign of addiction.

2.   For a drug to be physically addictive, it must create both tolerance in a user and a withdrawal syndrome.

3.   If you give a cannabinoid-blocking compound to a marijuana addict, all of a sudden you see severe withdrawal syndrome.

4.   Scientists are not sure about exactly what causes a hangover, but one popular theory holds that it is a minor case of alcohol withdrawal syndrome.

5.   The Rev. Jesse Jackson has suffered severe public exposure withdrawal syndrome since his last quixotic quest for the White House.