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Jonesing for java: Could caffeine use predict risk for cocaine abuse?
Date:10/7/2011

were no significant differences regarding pre-study caffeine intake or other characteristics between the two groups. During the second phase of the study, all participants received various doses of d-amphetamine and rated how much they liked or disliked each dose. The researchers found that caffeine Choosers reported significantly more positive subjective effects and fewer negative/unpleasant effects of d-amphetamine compared to Nonchoosers, particularly at the highest doses. On the other hand, caffeine Nonchoosers reporter fewer positive effects and more unpleasant effects of d-amphetamine compared to Choosers.

According to Sigmon and Griffiths, the study is the first to demonstrate that caffeine reinforcement prospectively predicts the positive subjective effects of another drug.

"While these data do not mean that every coffee lover is at risk for proceeding to cocaine abuse," says Sigmon, "this study does show that individuals vary markedly in their subjective and behavioral response to psychomotor stimulants, and those for whom a modest caffeine dose serves as a reinforcer are the same folks who subsequently report more positive subjective effects of d-amphetamine. Future research will be important to examine whether caffeine reinforcement predicts vulnerability to reinforcement and abuse of classic psychomotor stimulants such as amphetamine and cocaine."

A total of 22 participants completed the study, which took place over a 10- to 14-week timeframe and was supported by funding from the National Institute on Drug Abuse.


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Contact: Jennifer Nachbur
jennifer.nachbur@uvm.edu
802-338-8316
University of Vermont
Source:Eurekalert

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