Three independent studies convinced me that surgical masks are shockingly good at protecting against particulate pollution, even particles as small as viruses
In the context of a multivariate regression, each estimate is interpreted as the change in that variable with all other variables in the model held constant : i.e., the odds ratio for EC use should reflect the effect of exclusive EC use regardless of whether a participant never, formerly, or currently smoked (provided that all model assumptions are met)
So, when people who smoke drop one on the ground, it is no different to littering any other item
And you don't have a growing line of exasperated travelers getting impatient while you stare at their belongings
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