Just observe how far that smoke travels. That was my point.
Sorry I wasn’t more clear.
Best,
L
Back when I was around smokers regularly, most frequently BLEW smoke out. That is not regular breathing. Someone blowing their exhaust of ANY kind deliberately and hard around me would be reason for me to iincrease separation.
Also, smoke is likely (IMHO) to be easier to eject than droplets of virus.
Not saying transmission is IMPOSSIBLE without symptoms, but I think the 10-15% figure for asymptomatic transmission sounds reasonable. It seems VERY obvious to me that someone sneezing and coughing would represent a much greater threat.
BTW - I know one person in serious danger of dying from coronavirus. The wife hasn’t caught it. He refused to be tested until he collapsed. That would also suggest casual contact with an asymptomatic person is not a high risk activity. But his symptoms weren’t coughing or sneezing, just increasingly severe weakness in his limbs.