This metal cross wick dipper by Wickman can be used to extinguish your candle and eliminate smoke.
To use this tool simply use the curved end to bend the burning wick in to the wax and hold for 3 seconds. Stand the wick back to its upright position and let your candle harden. Trim the wick to 1/4 inch before re-lighting to help prolong the burn time and reduce smoke.
Measures 8" x .1"