It takes a little extra work to get in touch with Andrea Boland. The Maine state representative answers e-mails and lists her business and home phone numbers on the Web. But unlike many politicians surgically attached to their BlackBerrys, she keeps her cell switched off unless she's expecting a call. And if she has her way, everyone in Maine and perhaps, eventually, the rest of the U.S. will similarly think twice before jabbering away on their mobiles.
In March, Maine's legislature will begin debating a bill she submitted that would require manufacturers to put a warning label on every...