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In as little as 12 hours, the carbon monoxide from smoke is out of your body and oxygen levels are back to normal

The National Cancer Institute defines a pack-year as a way to measure smoking history by multiplying packs smoked per day by years smoked

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A review of 19 lung cancer studies conducted by Case Western Reserve University failed to demonstrate significant associations between marijuana smoking and lung cancer after adjusting for tobacco use. A 2018 review from Imperial College London states that: There is currently no clear association between cannabis smoking and lung cancer, although the research is currently limited