Figure 1.
(A) Urine total nicotine equivalents (TNE); (B) TNE/cigarettes per day (CPD) ratio in Chinese compared with US smokers. Data shown as medians and IQ intervals.
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.