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Cotinine has a 24-hour half-life, so you can test whether or not someone has been smoking in the past day or two by screening his or her urine for cotinine

How To Calculate a Pack Year According to the National Cancer Institute at the National Institutes of Health (NIH), a pack year is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years an individual has smoked

With departures, that pretty much cancels out your smoking zones

This includes cigarettes and vapes even if the vape says its nicotine-free. Common nicotine products People usually think of nicotine in cigarettes, but its in lots of different products