Keeping your wick properly trimmed will make your candle last longer and will prevent the wick from smoking. The fragrance from a scented candle is released into the atmosphere from the liquid wax pool that forms on the surface of the candle. The candle flame’s only job is to create that liquid wax pool. A trimmed wick will enable that wax pool to be formed without burning off unnecessary wax and fragrance oil. A large flame will cause your candle to burn faster, as well as burning up fragrance instead of allowing you to enjoy it fully.