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After one cigarette: Urine can show cotinine for up to 4 days Blood levels may return to baseline in 23 days Saliva typically clears cotinine in 14 days For chronic smokers, cotinine accumulates and can stay much longer

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FAQ: Air Purifier and Dehumidifier Answers to Frequently Asked Questions Key Terms Air Purifier, Dehumidifier What is an Air Purifier An air purifier (air cleaner) is a device designed to remove dust, pollen, smoke, and other unwanted particles from the air in a room, and helps to improve indoor air quality