If you have the chance to own a copy of Counter-Strike: Source you will notice some changes in the game.
Source Engine ( TF2, DoD:S, CS:S )
Fixed hang when typing "map" twice in the console
Counter-Strike: Source
Smoke Grenades
Made them bloom faster
Made them more opaque
Fixed "one way" smoke
Changed walk speed to be 0.52x of run speed ( Counter-Strike 1.6 )
Source: Steam