Very interesting. Sounds like she wasn't keeping the wicks trimmed. Gold Canyon do NOT smoke if you keep them trimmed, as with ANY candle, keep the wicks trimmed and it reduces soot. Even Soy candles smoke if you don't take proper care of them. I burn my jars for 3 hrs, wick dip it out, trim wick and relight and no problems. Also do not ever BLOW OUT candles, that makes them smoke too. Use a wick dipper. I burn GCC and have never had one smoke.