Jamieson et al have published an article titled Do Films About Mentally Disturbed Characters Promote Ineffective Coping in Vulnerable Youth? in the October issue of Journal of Adolescence. They found that the more exposure depressed teens had to films depicting mentally disturbed characters, the less likely they were to believe that professional mental help treatment was effective. The authors suggest that "exposure to fictional depictions of characters failing to get help for mental disorders may have long-term effects on depressed and suicidal youth."
Healton et al have published an article titled Televised Movie Trailers: Undermining Restrictions on Tobacco Advertising to Youth in the September issue of Archives of Pediatric and Adolescent Medicine. They found that 14% of movie trailers shown on television in a one-year period contained smoking imagery. 95% of youth ages 12-17 saw at least one of these trailers during that time. Healton et al suggest that given the connection between exposure to smoking imagery and smoking initiation, public health workers should aim to eliminate the use of tobacco in movie trailers. You can see other studies on tobacco in the media in the CMCH Database of Research.