I have never used smoke grenades once evarrr. But I picked up someone's kit (probably yours Czee, lol) and they had them equipped. THEY MAKE THE COOLEST SOUND! And I want to use them now.
smoke nades are an awesome weapon as well as a useful attachment. They provide cover for your team, they are a one hit kill, they are embarrassing to get killed by, and they make a huge cloud of smoke when you kill someone which I think is hilarious. extra nades perk gives you extra ones and you still get to use a good gun and pistol the rest of the time. it's also got a lot better range than the 40mm shotty attachment.
smoke nades are gud