People who ingest nicotine may take around 5–25 minutes longer than nonsmokers to fall asleep. People who smoke cigarettes also generally sleep for a shorter time than those who do not smoke. They ...

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 ...

Whether you're smoking cigarettes or vaping e-cigarettes, you're ingesting nicotine. Either way, the addictive substance is linked to a host of health issues, and experts say they still don't have a ...

After a free, evidence-based guide to health and wellness? Sign up to our weekly Well Informed newsletter. BY SOME reckonings, nicotine is as addictive as cocaine. It has led legions to a slow death ...