Here in the Basel, Switzerland area there are mask mandates when shopping or taking public transit. Yet every day when I walk to or from the train station, I see dozens of people smoking outside the station or in smoking areas in the station.
Obviously they're not wearing masks. Presumably some of the smoke comes from their burning cigarettes, but some of it they exhale. There's no way to tell which type I'm inhaling, but I can tell I'm inhaling it from the smell and the taste, and these ear-loop masks don't block the smoke.
Assume we have two groups of people standing around outside. No one in either group is wearing masks. In one group, everyone is smoking.
Am I at a greater risk of contracting Covid-19 from the smoking group (and their exhaled smoke) than I am from the group breathing ordinary air?
