Packaging regulations in various countries also dictate things like mandatory health warning space, minimum pack dimensions, and even restrictions on colors or branding elements, all of which interact with how many cigarettes a manufacturer can fit into a compliant box
In contrast, there was an estimated 0.75% reduction per $0.25 tax increase in those making $25,000-$50,000
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However, there still may be some bias (toward a positive association) from including all smoking status groups in the same model, especially if there is an unaccounted-for interactive effect between EC use and smoking history (such that those with longer smoking histories have higher health risks) which could falsely appear to carry over to PWNS
4, the flavor chemical data were filtered to include only those refill fluids (17 of 20) that had at least one chemical at a concentration 1 mg/ml
