Quoted: ?Some studies have questioned these treatments, but the bulk of clinical trials have unequivocally endorsed them,? said Dr. Michael Fiore, director of the University of Wisconsin?s Center for Tobacco Research and Intervention and the chairman of the panel that wrote the guidelines. Dr. Fiore, who has reported receiving payments from drug makers, said that ?there are millions of smokers out there desperate to quit, and it would be a tragedy if they felt, because of one study, that this option is ineffective.?