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Depends on your risk tolerance.

Candle emissions have a low but known impact on your health. Plug in air fresheners don't have a known impact but they have god knows what chemicals in them. Maybe you'll get cancer at 60, maybe it would take three lifetimes of exposure to have any effect.

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I genuinely can't be convinced there are people alive today that the risk of one scented candle in the home and/or plug in air fresheners are higher than the background danger of auto, industry, and just general pollution. This seems like an anxiety in search of a problem, or am I very underestimating it?

It just seems like the road in front of my house is probably more of a problem than my vanilla candle.

The thing is that wind and sheer volume of air tend to mitigate the pollution but in the home the air can stay static.

I once forgot to extinguish a candle before going to bed, it burned down, and produced a massive amount of soot. Their was a stripe of black suit on the wall where the candle was standing, a black spot on the ceiling, and my upper lip and nostrils were black from soot.

I'm not sure what effect on my health a one time event like this has, but if I can avoid it I will.

I can't do anything about the pollution outside.

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