According to a respected neurosurgeon you should think twice before using your cell phone. Dr. Vini Khurana, states that using hand-held devices can be more dangerous than smoking in his recent, self-publicized, and non-peer reviewed study.
Department of Human Onocology's own Dr. Minesh Mehta made some recent comments on NBC Affiliate WMTV regarding this study. The video of that interview can be found here.