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Among men, especially in business or social settings, refusing a cigarette can even feel impolite

Calculating Puff Equivalence Attempting to give a single, definitive number for how many vape puffs equal one cigarette is fraught with challenges due to the variables mentioned above

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The CDC explicitly notes that using alcohol and cannabis together is likely to produce greater impairment than either alone

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