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.
Forest plot of estimates of absolute change in the prevalence of adult smokers two years after the introduction of plain packaging (holding other factors constant). [Prevalence rates provided to experts were: Britain: 21%; Australia: 18%; Canada: 17.5%].
