A recent study found that selegiline (Deprenyl), [reduces withdrawal symptoms of smokers who are trying to quit. Another study to confirm those results is under way and will be finished in 2008. Selegiline helps users maintain higher levels of dopamine, a brain chemical associated with pleasure. People trying to quit smoking produce less dopamine, which can cause them to be irritable and nervous. The drug is currently used for Parkinson's disease patients.

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