Even though smoking rates have declined, cigarettes still kill hundreds of thousands of Americans every year
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Similarly, you can buy rubber gaskets for doors that are already prepared with adhesive in most DIY stores
This represents a liability risk
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
