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They can be life-threatening if they rupture (break open)

Furthermore, the black carbon particulate matter released enhances the absorption of radiant heat in the atmosphere, making global warming worse, and prematurely melts already imperiled mountain snow pack

A California-based medical group also made the comparison between wildfire smoke and cigarettes for its patients last year, saying in a blog: "During intense wildfire events, researchers have estimated that breathing smoke-filled air for a day can be like smoking up to 22 cigarettes

Many air purifiers also use activated carbon filters, which are particularly good at neutralising odours