The honest answer is: it depends far more on the candle than on whether it is scented. Cheap paraffin candles, especially with a metal-core wick, can release soot and particulates when burned in a small, unventilated room — that is a real and measurable effect, not a myth. Fragrance oils themselves are a smaller concern for most people; the exception is genuine fragrance sensitivities, which are uncommon but real, and usually show up as headaches or irritation rather than anything more serious. The practical fixes matter more than the panic: burn candles in a ventilated room, trim the wick to about 6mm before every light, choose soy, coconut, or beeswax over paraffin, and avoid letting a candle smoke visibly, which is always a sign something is off with the wick length or draught in the room. None of this means scented candles are dangerous when used sensibly — it means the wax and wick matter more than the scent does.