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The decline of tobacco happened after it was declared a health hazard and a cause of cancer in the mid-1900s

Thank you again for taking the time to share your thoughts, Kevin

Independent research shows these products emit substantial levels of carcinogenic, tobacco-specific nitrosamines, irritants and potential carcinogens, as well as similar nicotine and tar levels to a standard cigarette, the paper states

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