A chipper is an occasional drug user who does not use drugs with the regularity or frequency typical of addicts. It is used particularly to refer to opiate users and tobacco smokers. Above a certain threshold they develop regular cravings and become addicted. The term dates at least to the 1970s, where it is used in reference to opiate use and was used notably in reference to tobacco by psychologist Saul Shiffman and journalist Malcolm Gladwell.
The Daily Omnivore 
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