Eons before Europeans arrived in North America, Native Americans cultivated the tobacco leaf for ceremonial activities and medicinal purposes for use during prayers and rituals. They presented the ...

Testing for cotinine can usually tell whether you smoke or vape versus whether you have had indirect exposure. How long it stays in your system depends on how you ingest the nicotine and how often.

Professor Kevin Lee’s research, funded by the American Heart Association, follows the effects nicotine has on the heart and ...

Nicotine quickly enters your bloodstream. Your liver then breaks down nicotine into several byproducts, primarily cotinine. Depending on what you're testing, such as a blood, urine, saliva, or hair ...