His smoking habits- Yao has a smoking habit that developed during the opium wars with Arthur and other European countries and some of Asia as well. And even though with the help of Alfred though out the year's of finding other things to keep him relax and at bay like meditation or Buddhism he can't get the same high and relaxed feeling from them. Even plain old regular cigarettes did nothing to help but he did effectively find a brand new addition when so happens to be the cuteness of Alfred especially his adorable kitten eye's that makes him week in the knees.