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Nicotine withdrawal weakens brain connections tied to self-control over cigarette cravings

A new brain imaging study shows how smokers suffering from nicotine withdrawal may have more trouble shifting from a key brain network?known as default mode, when people are in a so-called ?introspective? state -? and into a control network that could help exert more conscious, self-control over cravings and to focus on quitting for good.
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