i got this in an email
NEVER LIGHT a CANDLE   in
Airconditioned ROOMS
Prevention is better than cure..
A friend in our group   (Aramco, Saudi) passed away last week due to carbon
–monoxide   poisoning. It happened   when she lighted an aroma therapeutic
candle for the night in a room with Air-conditioner ON .
Due to lack of oxygen in the room,   the burning of the candle cannot fully
oxidise & thus form dangerous carbon   monoxide.
Carbon monoxide will prevent oxygen exchange in the lungs, resulting in the
person dozing-off into a state of   unconsciousness & eventually   death in
less than an hour, depending on the room size.
This email is to make you aware of such danger when   lighting aroma
therapeutic candles in any un-ventilated rooms.
Please forward this e-mail to all your loved ones and   friends.

