Data: OpenAI; Chart: Axios VisualsMore than 40 million Americans turn to ChatGPT daily for health information, according to a report OpenAI has shared exclusively with AxiosWhy it matters: Americans are turning to AI tools to navigate the notoriously complex and opaque U.S. health care system.The big picture: Patients see ChatGPT as an "ally" in navigating their health care, according to analysis of anonymized interactions with ChatGPT and a survey of ChatGPT users by the AI-powered tool Knit.Us...