Adolescents' perceptions of cannabis use by their peers: does it have anything to do with behavior?

Young people perceive there are many more people using cannabis than any surveys can document. As part of an education program, students were exposed to survey data to influence their perceptions and in turn to affect their use and intentions to use cannabis in the future. This large study showed that perception has no relationship to use or intentions to use, and that changing perceptions of use is very difficult.