The caudate nucleus, an area of the brain that controls voluntary movement, illustrates this adaptation. Without the nicotine, neurons cannot maintain impulses at the levels they had previously. As a result, some smokers experience hand tremors between cigarettes. These "smoker's tremors" may be hard to see, because a smoker hides them by smoking another cigarette. The tremors may be a sign of withdrawal, but they will go away if the smoker gives up smoking for good.
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