I just noticed this today, so I thought I’d throw it on the Spash Damage forums ( I presume this is where Splash Damage want bugs feedback?? If not, could somebody please advise, cheers ).
Smoke is invisible through windows.
Smoke grenades are designed to make your teammates or an objective ( or whatever ) invisible. But if somebody is looking through a window - they don’t see the smoke, they see what you’re trying to hide as if the smoke wasn’t even there.
Try it out yourself. Go Allied C-Ops on fuel dump. Go to either of the buildings, and throw a smoke gren just inside or outside the building. Look through the windows - clear view. Look through the door - can’t see because of smoke.
Hope this gets patched. The game is of a very high standard of quality - and it’s good to see so few bugs! Keep up the good work, Splash Damage! 
