Nicotine and its byproducts may stay in your body for hours, days, or longer, depending on how often you've used nicotine and ...

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 ...

Nicotine withdrawal symptoms often include cravings, irritability, and weight gain. Certain medications and lifestyle changes ...