| List of Tables | p. ix |
| List of Figures | p. xi |
| Acknowledgements | p. xii |
| Introduction | p. 1 |
| Review of Literature | p. 10 |
| Introduction | p. 10 |
| Research on peers | p. 11 |
| Research on peer groups using a social network approach | p. 13 |
| Research on parents | p. 21 |
| The relative impact of parents and peers | p. 23 |
| Conclusion | p. 25 |
| Research Methods | p. 28 |
| Introduction | p. 28 |
| Survey research methods | p. 29 |
| Sources of the data | p. 29 |
| The community: Census of families | p. 29 |
| Population of teenagers | p. 29 |
| The snowball sample of peers | p. 30 |
| Methods of data collection | p. 31 |
| The pilot study | p. 31 |
| Data collection | p. 32 |
| The questionnaire | p. 33 |
| Social network questions | p. 33 |
| Substance use questions | p. 35 |
| Coding and data analysis | p. 36 |
| Coding | p. 36 |
| Data analysis | p. 36 |
| Social network analysis | p. 36 |
| The complete network and peer groups | p. 36 |
| Snowball sample of peer ties | p. 39 |
| Accuracy in network measurement | p. 39 |
| Conclusion | p. 40 |
| The Teenagers and their Substance Use | p. 42 |
| Introduction | p. 42 |
| The teenagers | p. 42 |
| Gender | p. 43 |
| Age | p. 43 |
| Occupational status | p. 43 |
| Leisure time | p. 46 |
| Substances used by the teenagers | p. 47 |
| Cigarettes | p. 48 |
| Alcohol | p. 48 |
| Drugs | p. 48 |
| Combinations of substances used | p. 49 |
| Teenagers' substance use by gender | p. 50 |
| Teenagers' substance use by age | p. 51 |
| Teenagers' substance use by occupational status | p. 52 |
| Teenagers' substance use by education | p. 53 |
| Conclusion | p. 54 |
| Teenagers' Substance Use by Family Influences | p. 57 |
| Introduction | p. 57 |
| The teenagers' families | p. 57 |
| Teenagers' substance use by family circumstances | p. 58 |
| Teenagers' substance use by intact or broken family home | p. 58 |
| Teenagers' substance use by employment status of parents | p. 59 |
| Teenagers' substance use by social class of the family | p. 60 |
| Teenagers' substance use by parental substance use | p. 61 |
| Teenagers' substance use by closeness to parents | p. 62 |
| Teenagers' substance use by parental influence | p. 64 |
| Parental control of the teenagers' substance use | p. 65 |
| Parental advice against substance use | p. 65 |
| Parental control of choice of friends | p. 66 |
| Parental control of teenagers' free-time activities | p. 66 |
| Teenagers' substance use by siblings' substance use | p. 67 |
| Teenagers' substance use by siblings' influence | p. 68 |
| Conclusion | p. 68 |
| The Role of Peers in Teenagers' Substance Use | p. 71 |
| Introduction | p. 71 |
| Selection of peers | p. 72 |
| Formation of peer groups and the complete network | p. 74 |
| Teenagers' substance use by their social position | p. 76 |
| Similarity in substance use in dyads | p. 80 |
| Similarity in substance use in peer groups | p. 83 |
| Conclusion | p. 86 |
| Peer Influence and Selection in Peer Groups | p. 89 |
| Introduction | p. 89 |
| Peer Group 4 | p. 90 |
| Peer Groups 8 and 9 | p. 99 |
| Conclusion | p. 102 |
| Chain Reactions in Teenagers' Substance Use | p. 105 |
| Introduction | p. 105 |
| Rates of substance use in population and in case studies | p. 106 |
| Similarity in substance use in dyads in complete network | p. 106 |
| Peer influence in the population of teenagers | p. 108 |
| Case studies of peer groups | p. 108 |
| p. 109 |
| Similarity in Peer Group 1 | p. 116 |
| Peer influence at first substance use in Peer Group 1 | p. 117 |
| Peer influence in current substance use in Peer Group 1 | p. 119 |
| Peer influence or selection in Peer Group 1 | p. 119 |
| p. 119 |
| Similarity in Peer Group 2 | p. 120 |
| Peer influence at first substance use in Peer Group 2 | p. 121 |
| Peer influence in current substance use in Peer Group 2 | p. 123 |
| Peer influence or selection in Peer Group 2 | p. 123 |
| p. 123 |
| Similarity in Peer Group 3 | p. 123 |
| Peer influence at first substance use in Peer Group 3 | p. 124 |
| Peer influence in current substance use in Peer Group 3 | p. 126 |
| Peer influence or selection in Peer Group 3 | p. 127 |
| Conclusion | p. 127 |
| The Role of Gender in Chain Reactions | p. 131 |
| Introduction | p. 131 |
| Gender and the selection of peers | p. 132 |
| Substance use among the teenagers by their gender | p. 135 |
| Gender and peer influence | p. 140 |
| Gender and the patterning of peer ties | p. 143 |
| Gender in chain reactions | p. 147 |
| Conclusion | p. 148 |
| Discussion and Conclusion | p. 150 |
| Discussion | p. 151 |
| Conclusion | p. 163 |
| Questionnaire | p. 168 |
| Absolute Alcohol Consumption Index | p. 181 |
| Drug Classes | p. 182 |
| The Patterning of Peer Ties in Peer Groups 6 and 7 | p. 183 |
| Glossary of Terms | p. 185 |
| Bibliography | p. 189 |
| Index | p. 197 |
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