Since all waxes create soot, it's wise to ensure that the space where you light your candle is well-ventilated. Breathing in any type of smoke can be hazardous — and candle smoke is no exception, especially when contained, according to Healthline. That's because the combustion from burning candles made with paraffin wax has been likened to that of a diesel engine. Lots of ventilation and steering clear of burning your candles in drafty areas can help to reduce the amount of smoke they release.

Finding candles with 100 percent cotton wicks also proves vitally important to keeping your candle habit healthy. While putting lead in candle wicks was banned in 2003, companies can still use a metal core for their wicks that contain the harmful compound (via MindBodyGreen). Look for a candle with a pure cotton wick or a wooden wick that doesn't create soot or leave an ashy residue.

Indoor air quality, especially as we spend more time in our homes, is vitally important to our overall health and wellbeing. Look for candles made with high-quality ingredients, natural fragrances, and clean wicks to keep your space filled with warm, safe scents.