Older adults who smoke tobacco and have higher levels of cotinine, a biomarker that shows tobacco exposure, have higher chances of pre-frailty and frailty, a new study finds. Helping older adults ...

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 ...

The characteristics of this study population are outlined in Table 1. African-American children were slightly older than white children, and resided in households with a smaller volume.