Smoking leaves measurable changes in the body that show up in blood tests, including high cotinine levels, altered cholesterol and increased inflammation markers. These changes can affect diagnosis, ...

Nicotine itself could clear from your body in a few hours, but its byproduct can linger for days or weeks. Most nicotine tests detect cotinine, which can show up in urine, saliva, blood, hair, and ...

Smoking affects the brain in serious ways, from memory loss to stroke. Learn the hidden dangers of nicotine and how can ...