Unfortunately, that's not generally known at all. Most people I speak to are very surprised when they learn that burning candles is pretty much the same as second hand smoking.

Interesting, can you share any further reading? A quick Google turns up surprisingly little evidence-based guidance. For what it's worth, I found this Cleveland Clinic general-audience (non-peer-reviewed) article that concludes "the science isn’t strong enough to suggest we should stop buying and burning candles": https://health.clevelandclinic.org/are-candles-bad-for-you

Intuitively, adding any amount of combustion product to the air is bad, but the above article suggests that burning an occasional candle is inconsequential compared to, say, cooking indoors.

My phrasing was perhaps too strong. I learned this from here https://dynomight.net/air/ This is a great read. Here is a previous HN discussion on this: https://news.ycombinator.com/item?id=26964722 There are some disagreements but I find the argument that air quality is greatly underappreciated as a health risk convincing. And that candles cause bad air quality.

The article talks a lot about healthspan which I think is a great measure and idea. Your referenced article talks about at-risk people and that they should avoid candles. It also states that candles should be burned in well ventilated spaces, which I believe most people don't do as they don't consider it.

A healthy persons healthspan is negatively affected by candles and such. They just have more health to spare.

The article talks about cooking as well and they are likely talking about cooking with gas which is very unhealthy. It should be illegal to sell indoor gas stoves for cooking in my opinion.

How do you even use an aerosolized detergent? Just reach into the dishwasher, spray, and quickly close the door?

I assume it's for the obnoxious activity of hand washing that some of us have to deal with

Oh, that makes more sense. Terminology mistake on my part, the word "detergent" to me only refers to the soaps used in machines.

Although, on reflection, it still doesn't make a whole lot of sense in that context...

Hand washing is, bad?

In the US, most non-studio apartments have dishwashers.

When I moved here from the UK, where dishwashers are more of a luxury item, I was confused by just how much some people loathed hand-washing dishes.

Oh, I thought they were complaining about washing your hands.