The alloy I'm using has a speck of tin in it. Smoking with wood matches seemed to work better for me with Lee molds in the past. Smoking with candles seemed to leave residue in the cavities, but whatever works for ya is my motto. I think it depends on the composition of the candles. I don't smoke my molds much anymore.
Couldn't wait til ambient temps reached the 50's, that doesn't happen for a coupla months here, except occasionally, when we get those marvelous chinook winds that seem almost heaven-sent. The urge was too great to resist, though, and I got enough good'ns to give me an idea of what these molds are going to produce. Some look upon casting as onerous, at best. For me it's a very therapeutic activity. Come next spring, ah.....well, can't wait.