Sex-specific initiation rates of tobacco smoking and its determinants among adults from a Middle Eastern population: a cohort study
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To assess the initiation rate and determinants of tobacco smoking among adults.
In the Tehran Lipid and Glucose Study, a population-based cohort from Iran, 6101 participants ≥ 18 years old who had never smoked tobacco at baseline (phase II: 2002–2006) were followed until phase VI (2015–2018). Sex-specific initiation rates per 1000 person-years for self-reported tobacco smoking and hazard ratios (HR) for its potential determinants (using Cox proportional hazards models) were calculated.
The age- and sex-adjusted smoking initiation rate was 13.77 [95% confidence interval (CI) 12.59–14.94] per 1000 person-years, of which 78% was attributed to water pipe use. Initiation rate was remarkably higher among men [19.1 (16.9–21.2)] than women [8.3 (7.4–9.2)] and declined in older age-groups. Among both genders, being married was protective [men: HR 0.67 (CI 95% 0.48–0.92); women: 0.58 (0.45–0.74)], while intermediate-level education (compared with high level) [men: 1.61 (1.14–2.26); women: 1.33 (0.95–1.84, p value = 0.092)] and passive smoking [men: 1.76 (1.36–2.28); women: 1.82 (1.42–2.33)] increased the risk. Educational intervention decreased the risk among women [0.74 (0.58–0.94)].
The majority of adult smoking initiators started smoking with water pipe. The initiation rate was remarkably higher in men and younger age-groups. Passive smoking, being single and lower education were risk factors. Educational intervention was protective among women.
KeywordsTobacco Water pipe Cigarette Smoking Initiation rate Intervention The Tehran Lipid and Glucose Study
The authors wish to acknowledge Ms. Niloofar Shiva for critical editing of English grammar and syntax of the manuscript. The authors would also like to express their appreciation to the TLGS participants and staff for their kind cooperation.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict interest.
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