Figure 1.
Local polynomial showing weekly counts since July 2003. The shaded regions are 95% confidence intervals. The vertical line indicates the date of implementation of the smoking ban.
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.