My previous response seems to have vanished.
Oh well. I'll sum it up.

If you lack the skills to do something, you don't get to decide how others should do it.
Your avatar is extremely cringy, even more so because it's fan art for your youtube channel.

If you want something done right, do it yourself, so maybe make your own fog mod, and make an avatar that feels a little less like the worst parts of 2008 mall culture.

The Yellow smile face? its fan art for my YouTube channel. And i want an easy fog mod to make L4D2 into a Horror game and i'm not a PC main, id like it to be easy. if you cant make an easy mod your bad at modding as simple as that. mods are made to make the game more fun and installing mods are supposed to be easy that's why people would rather download mods instead of doing it their self's because its hard. People have better things to do then to mod plus not everybody can do it. so my advice lose your EGO and act like a normal person and fix your shit dog because you act like a prick. like dude i just started playing L4D on PC and i haven't been on PC since 2015 so i have no idea how to mod or how to do these kind of levels of modding, its all complicated mumbo jumbo.....

I don't make easy mods, I like the challenge.If it's the dumbest shit you've seen why do you want to use it?

Also the early 00's is calling they want your edgy, emo, and altogether cringe icon back.

this is the dumbest shit ive seen in a mod. JUST ADD FOG STUPID i wanna use my costume player models. make an easy mod that makes fog nothing else.

Nah, not at all. It's a cloud of translucent particles, attached to the hands. It's based on mods like this.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1204677508&searchtext=leaves

that could work, i just assumed the way the fog works is like with olde's various color corrections, each one is tied to a certain map in certain campaigns

Only way I could imagine that, is if I can attach different particles to different hands. Which I believe I could.

The l4d1 cast would have one fog color, and the l4d2 cast the other, or different for every character. But it wouldn't be based on what campaign you were playing.

this intrigues me, could you maybe think about doing game color-coded fog? like for L4D1 the green death fog, and yellowish fog for l4d2 campaigns?