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If you're dealing with stale smoke in a bedroom, a living room that never quite smells clean, or an AC system that seems to spread odor instead of removing it, you're not imagining it

It also contains phenols responsible for the unpleasant taste and throat irritation, aldehydes (formaldehyde, acrolein) toxic to the cilia of the respiratory epithelium, and heavy metals absorbed by plants from the soil (cadmium, lead, chromium)

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Heat and chemicals cause irritation: The hot smoke and toxic chemicals from cigarettes can irritate healing tissues, increase inflammation, and create an environment where harmful bacteria multiply more easily