Chris Blattman retitles a paper on adolescent peer pressure, “Everything I know about peer effects I learned from the Breakfast Club”:
The likelihood that one friend initiates intercourse within a year of the baseline interview increases by 4 percentage points (on a base of 14%) if the other also initiates intercourse, holding constant family and individual factors. Similar effects are also present for smoking, marijuana use, and truancy. We find larger peer effects for females and for pairs that are more likely to remain best friends after a year.
The Dish 