| CI | Confidence interval; |
| CO | Carbon monoxide; |
| FTND | Fagerström test for nicotine dependence; |
| NRT | Nicotine replacement therapy; |
| OR | Odds ratiol |
| ppm | Parts per million. |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.