They work very well. Just not in the killcam sometimes. Even though you can't see it in the kill cam there was smoke everywhere in the game.

The smoke grenades work very well in this game. You can't see any one in it until you get pretty damn close to them and then you just see outlines until you're touching. I use the smoke grenade all the time as an escape tool, a decoy, I use it to get me to positions I can't fight my way to with my SMG, I use it to help team mates, I use it to make enemies not want to run through an area, I use it to cover objectives.... I just wish we either had two smoke grenades, I wish they did a tiny bit of dmg on exploding into the smoke which would go really well with recon! It would be nice as well if the smoke wasn't so verticlally restricted. For example if I try to throw it over top of my cover and mess up the throw, I've had times where the grenade will get stuck on top of a car, stuck in a window sill, things like that where the grenade is raised off the ground, the smoke spreads out and up a little bit, but not down at all leaving the bottom half of every ones torso exposed.... Those throws piss me off so much .