I recognize this is a pretty newbie question to ask (which makes sense since I'm new to FPS games), but I wonder if people can give me their thoughts on what the purpose of smokes are on defense. I've got a reasonable idea of what they're for on offense and am able to intuit lineups on that basis (while also watching videos). I'm having much more trouble not screwing with my teammates on defense through bad smoke placement and have tended to not use them at all on defense unless explicitly asked. I've tried asking my friends, but I think people misunderstand my level of expertise because they inevitably start throwing lineups at me with no explanation as to how they came up with them. A simple explanation of how you think about using them would be much appreciated!