As someone who requests a non-smoking room for medical reasons (my DS 2 has severe asthma), I'd appreciate you not burning a candle in the room. My son's asthma is triggered by his allergies, and a lot of different smells can get to him. If a very smelly candle was burned in the room prior to our arrival, it might cause him to have an attack. Even though you might not be able to smell anything, there might be enough scent left to trigger an attack for my son. It has happened before, that's why I know. My sister had burned a Yankee Candle at her house the day before we came over, and he had an attack. The scent was a floral one, one of the things that can set him off. So, PLEASE don't do this, you might be causing the next guest harm.