Server Side Smoke Nades..
 

I've found some files that tell how long and big the smoke is after BOOM!
But I don't know how to get it so its with realism ........

I have smoke grenades
but there kind of like a skin..
others cant see it unless others have it.
Plus if you where to add it to a mod.. the file will continue to change grenades explosion in all games..
Might just be better to wait for the expansion pack.