Our hotel room allowed smoking. Isn't smoking allowed indoors in Japan?

According to the Revised Health Promotion Act, as a general rule, smoking is not allowed at facilities used by large numbers of people in Japan, and smoking is only allowed in specified locations. However, hotel guest rooms are exempt from this regulation. For this reason, hotels may offer both smoking rooms and non-smoking rooms for guests. The odor of cigarettes may linger in smoking rooms. For those who dislike the odor of cigarettes, it is better to check directly with the hotel prior to making a reservation if you can get a non-smoking room.