Figure 1.
Average machine-measured tar content of cigarettes in the Chinese market has declined over 25 years (adapted from Lei et al12).
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.