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The level of CO for a smoker is usually much higher

Moreover, educational attainment has been a widely used proxy for social disadvantage in previous studies and it is less prone to endogeneity bias from reverse causality (smoking effecting educational attainment) than measure such as income

52 Tan et al found that concurrent cannabis and cigarette smoking synergistically increased the risk of respiratory symptoms and COPD when compared to those who only smoke cigarettes and nonsmokers

Original I already mentioned that the lightly salted original version of Pringles misses the mark specifically because it doesn't pack enough salt for an otherwise relatively bland snack

Hallmarked with the French 18K gold standard mark in a form of an eagle's head in use in France from 1838. In overall good antique condition, with wear to the case commensurate with age