article_snippet: Doctors are advised to weigh the drug's risks against the drug potential benefits of helping patients quit smoking.
article_snippet: Pfizer's drug works by binding to the same spots in the brain that are activated by nicotine when people smoke.
article_snippet: The drug, known generically as varenicline, blocks nicotine from binding to those spots and prevents the release of 'feel-good' brain chemicals that make smoking so addictive.