Setting the mood with candles could mean setting yourself up for respiratory problems. According to Andrew Weil’s Self Healing newsletter, the burning of the fragrant oils in scented candles can create significant air pollution, potentially comparable to that produced by diesel fuel exhaust. The produced soot particles can lodge deep in the lungs, especially a concern for young children, the elderly and those with asthma or other already established respiratory problems. Weil recommends unscented beeswax candles with cotton wicks when adding ambiance.