Fact
The more 10-14 year olds in the U.S. see smoking in movies, the more likely they are to start smoking.
Source 1:
"Preventing Tobacco Use Among Youth and Young Adults: A Report of the Surgeon General Executive Summary." U.S. Department of Health and Human Services, Public Health Service, Office of the Surgeon General. 2012.
http://www.surgeongeneral.gov/library/reports/preventing-youth-tobacco-use/exec-summary.pdf