Research article
Nicotine-dependence symptoms are associated with smoking frequency in adolescents

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Abstract

Background

Although many sociodemographic and psychosocial factors have been identified as related to adolescent smoking, few studies have examined the role of nicotine-dependence (ND) symptoms. The objective was to study the association between ND symptoms and smoking status among adolescents in the early stages of the smoking onset process.

Methods

The McGill University Study on the Natural History of Nicotine Dependence is an ongoing 6-year prospective investigation of the natural history of ND among 1267 grade 7 students in ten Montreal high schools. The baseline response was 55.4%. Subjects for this cross-sectional analysis of baseline data, collected in 1999, included 241 past 3-month smokers (mean age [SD]=13.0±0.7 years at baseline). ND symptoms were measured in five indicators, including a measure based on the criteria for tobacco dependence in the International Classification of Diseases-10th Revision (ICD-10), the Hooked on Nicotine Checklist, and three symptom clusters (withdrawal, self-medication, and ND/cravings symptoms). The association between ND symptom indicators and each of sporadic, monthly, weekly, and daily smoking relative to less frequent smoking was investigated in multiple logistic regression analysis.

Results

Despite low cigarette exposure, 16.6% (95% confidence interval [CI], 11.9%–21.3%) of past 3-month smokers were tobacco dependent. The proportion increased from 0%, 3.1% (95% CI, 0.0%–9.2%), and 4.6% (95% CI, 0.2%–9.0%) among triers, sporadic smokers, and monthly smokers, respectively, to 19.4% (95% CI, 5.5%–33.3%) and 65.9% (95% CI, 51.9%–79.9%) among weekly and daily smokers, respectively. ND/cravings consistently distinguished each smoking category from less frequent smokers; the odds ratios (95% CI) for ND/cravings symptoms were 1.16 (0.99–1.35) in sporadic smokers; 1.17 (1.06–1.29) in monthly smokers; 1.34 (1.19–1.50) in weekly smokers; and 1.39 (1.22–1.59) in daily smokers.

Conclusions

These data challenge current smoking onset models, which suggest that ND develops only after several years of heavy or daily smoking. ND symptoms are associated, at least cross-sectionally, with increased smoking in adolescents. To increase the likelihood of being effective, tobacco-control programs for children and adolescents will need to take early ND symptoms into account.

Introduction

Progression to nicotine-dependent smoking has been conceptualized as proceeding sequentially over 2 to 3 years through five stages, including the preparatory, trying, experimentation, regular use, and addiction dependent stages. Lengthy and regular tobacco use has been considered necessary for nicotine dependence (ND) to develop.1 Recent reports,2, 3, 4 however, have raised concerns that ND symptoms can develop soon after initiation, and that these symptoms might lead to smoking intensification. DiFranza et al.2 showed that approximately 20% of adolescents reported ND symptoms within 1 month of initiating monthly smoking.

Although many sociodemographic, psychosocial, and environmental factors are related to adolescent smoking,1 few studies have examined the role of ND symptoms. This oversight relates in part to the assumption that ND cannot develop before sustained heavy tobacco use and therefore cannot contribute to the establishment of daily smoking. Also, there is no widely accepted, theoretically derived, and psychometrically sound tool to measure ND in adolescents.5 However, several measures have recently been validated2, 6, 7, 8 so that ND symptoms can now be studied in adolescent smoking.

The purpose of this article was to assess the importance of ND symptoms in early smoking. The authors hypothesized that ND symptoms would occur before heavy daily tobacco use and would differentiate subjects on the basis of how frequently they smoked.

Section snippets

Methods

The McGill University Study on the Natural History of Nicotine Dependence in Teens is a prospective investigation of 1267 students, initially aged 12–13 years, who were recruited from all grade 7 classes in a convenience sample of seven English and three French secondary schools located in Montreal. The objectives were to measure the onset of ND symptoms in relation to tobacco exposure, and to investigate the relative etiologic importance of environmental, psychosocial, and genetic factors in

Results

In the baseline sample of 1267 students, 29.2% of males and 35.1% of females were ever smokers (p=0.03); 46.4% of male and 69.3% of female ever smokers had smoked in the 3 months preceding the baseline questionnaire (p<0.000). Table 1 compares selected characteristics of never, ever, and past 3-month smokers.

Past 3-month smokers reported a wide range of smoking experiences, from tried only once or twice to smoking 121 cigarettes per week (Table 2). Forty-seven subjects (19.5%) were triers,

Discussion

Although ND symptoms are recognized as barriers to cessation in youth,21, 22, 23 few studies examine their influence early in the smoking onset process. In this study, even adolescents who had smoked only once or twice reported ND symptoms. Both the range and prevalence of specific symptoms increased markedly with increased frequency of smoking. It is striking that despite low cigarette exposure, high proportions of weekly and daily smokers were ICD-10 tobacco dependent. ND/cravings emerged as

Acknowledgements

This research was funded by the National Cancer Institute of Canada, with funds from the Canadian Cancer Society. J. O'Loughlin is an Investigator of the Canadian Institutes of Health Research. P.B.S. Clarke is a Chercheur National of the Fonds de la recherche en santé du Québec. R. F. Tyndale acknowledges the support of a Canadian Research Chair in Pharmacogenetics. The authors are grateful to the school administrators, teachers, and students who participated.

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