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.
Observations of individuals smoking and exposure to second-hand smoke among students: public 4-year colleges and universities, California, 2013–2014.
Note. P < .01. As the strength of tobacco policy increased, exposure to secondhand smoke and observation of individuals smoking significantly decreased.
