Itâs no secret that scent and mood are closely linked, and burning a candle can be a one-way ticket to a calmer, more relaxed state of mind. But could the wrong candle be doing more harm than good? Itâs a surprisingly controversial topic. While many conventional candles are still made with questionable ingredients, including paraffin wax, synthetic fragrances, and inferior oils, evidence of their negative health effects remains largely inconclusive. Still, if the idea of a nontoxic, clean-burning candle appeals to you, Iâve done the research and rounded up the contenders for your consideration. But first, hereâs a quick look at the ongoing discussion of candle toxicity.