No. Paraffin wax – like all candle waxes – is non-toxic. This answer was sourced/adapted from the National Candle Association (NCA) website. NEST Fragrances is a member of the NCA.Click to see full answer. In this regard, which candles are safe for your health? Keeping Your Home Safe with the Nontoxic, Healthiest Candles The healthiest candles include: soy and beeswax candles. candles with wicks made from braided cotton or paper with a cellulose core (the purpose of a “core” in a wick is to prevent the wick from falling over and extinguishing itself)Subsequently, question is, are Nest candles good? I will buy Nest candles in the future. They are a great even though pricey. You get so much more burn time, clean, and wonderful fragrance. Also, are Candles bad for your lungs? However, most scented candles are made from paraffin wax – and previous studies have found these can release cancer-causing chemicals that can also be harmful in people with respiratory conditions such as asthma.Is candle smoke harmful?A 2009 study by U.S. researchers found that paraffin-based candles release carcinogens and chemicals that could raise the risk of asthma. A longer candle wick will produce more soot and a smoky flame, which releases even more air pollution. So yes, candle smoke is bad for you and your lungs.