The objective of the study was to know the content of social representations about the consumption of drugs and also if those representations contributed and predicted the consumption of drugs among young people. Six beliefs about the social use of drugs were selected, such as whether it is common to take drugs. These beliefs were considered indicators of those social representations. The study was carried out among 417 students of Associate Degree and Social Guarantee Program from different Educational Centres of Granada, who were considered high risk drug users. Results showed that evaluated beliefs were present among young people, these beliefs predicted the consumption of legal and illegal drugs and were specially associated with the consumption of cannabis. Thus, social representations about the consumption of drugs should be considered for prevention programs.