I do not have information on Kit Harington (Jon Snow from "Game of Thrones") being in rehab. It is important to note that my knowledge is not current, and I do not have access to real-time information.
If Kit Harington has entered rehab or sought treatment for any reason, the specific details and reasons behind his decision would not be available in my database. It's essential to rely on up-to-date and accurate news sources for the latest information on any public figure's personal life and well-being. You can check recent news articles or official statements for the most current information on this matter.