Angela, they do give off less smoke, but they still mushroom. In fact, they give off little to no smoke in the candles I put them in. I used to LOVE my CD wicks, and still occasionally use them, but they would smoke if I didn't wick the candle perfectly because I max out the FO load in my candles. I don't think they mushroom as much as the original zincs, but it could be my opinion. I like them mostly because they burn a little hotter than regular zincs and there are enough sizes that I can usually find the correct one for any application. (sizes go 15, 17, 19, 21, 23, 25, 29,31 plus 1 for votives and 1 for tealights) It really is a matter of opinion though, since some people hate zincs and some love them DanaE