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.
Note.
The most complex version of each webpage is shown. Experiment 1 used the first layout, Experiment 2 used the second layout, and Experiment 3 used the third layout. Webpage footers had minor variations based on the experimental condition (eg, if the webpage did not list NNN, the footer did not explain that NNN is N-Nitrosonornicotine).
