At the end of my stay the experience soured. I am ...

At the end of my stay the experience soured. I am a non smoker and absolutely hate smell of cigarettes. We specifically had asked and got a non smoking room. However on the third night I ended up having to endure cigarette smoke filling in my room through the a/c duct. The reception did not help at all. The only option given to us was changing rooms at 11:30 pm. How is smoking inside a hotel room even allowed?

On a positive note- The Thai restaurant- Pacheylan is excellent. Every single individual in that restaurant deserves commendation. The fact that they have a full page dedicated to vegans made my heart dance. The restaurant manager was extremely gracious.