Additionally, people with heavy exposure to secondhand smoke may also test positive, and levels may be between 0.5 and 10 ng/mL. Nicotine exposure using cotinine as a marker may be measured in ...

The FDA has given marketing authorization to Zyn nicotine pouches. That doesn't necessarily mean they're safe to use, ...

According to research, vaping, like smoking, has an immediate negative effect on the user’s blood flow — even if the vape does not contain any nicotine. A study published by the Radiological ...