We break exact linear dependency between the three explanatory variables (i.e., cohort = period age) and deal with under-identification by grouping birth cohorts into frequently used 5-year intervals, and, after confirmation of a curvilinear relationship, treat smoking as a quadratic function of age 30
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Further long-term cohort studies to examine longitudinal/ temporal impact of tobacco smoke exposure on rhinitis in children would be merited
They may feel they need nicotine to go about their normal activities like working, studying, and socialising, or just to get through the day