I see... so masks are ‘one way’. Also, second hand smoke.
@Justaguy ...
Even people who smoke don't like second hand smoke. It's already been ingested. It's in someone's body already. Then they get rid of it.
It's like a ham sandwich. If you eat it, you want the initial ham sandwich. You don't want a second-hand ham sandwich that has been digested by someone. Come on man, a digested ham sandwich is well, call it what you want, but it is shit. Do you want a second hand sandwich? Do you say, that doesn't bother me? I certainly don't want second hand smoke, nor a second hand sandwich.