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"People generally know that smoking is harmful, but they tend to underestimate exactly how much

After 8 hours: The level of carbon monoxide (a toxic gas) in your blood drops to normal

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In a 2018 study, researchers found that cinnamaldehyde, or cinnamon flavoring, had the most significant toxic effects on white blood cells

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Among the many ill effects are breathlessness, diminished lung capacity and permanent injury to the alveoli, which are the hundreds of millions of minute air sacs in the lungs