The word on the street (cshacks.com), is that they're working on it and it will be available soon.

What is the no_smoke hack?
Ok, think of it this way. You walk down a hallway, your team mates are all crouched down behind boxes, the enemy seems to be plotting, and you see a grenade canister laying on the ground, no smoke, no explosion, no flash. An ordinary grenade, with nothing happening. That's right, it's a useless purchase if someone is using the no_smoke hack.

Often times people will use the Glowing Players (lambert) and the no_smoke hack to optimize their in-game abilities. While I personally don't care if someone on the other team, or the entire other team, is using either of the hacks (lambert and no_smoke), they are still cheats as they change the way the game was intended to be played.