Vast majority of smokers, at least the ones here in the US, are used to going long times without smoking while at work. So I suspect it's not like they'll have to run out every hour to grab a smoke
As to 2nd hand smoke, I've never felt it was something that was a huge issue outdoors. You aren't enclosed with it, forced to breathe it in. You have more than enough fresh air around you and can even step away from it, short of infants of course. While no, I don't want to hang out in smoking areas myself I've not felt th