Post any suggestions, mod incompatibilities, or issues you have here.

Issues I'm aware of:
Gas canister becoming unlit depending on the angle you view it from (not fixable by me)

Optimized Gas particles sometimes spawn sideways (no idea how to fix)

The grenades (the weapon, not the projectile) are invisible on the ground (custom hand grenade models were made using the SWEP creation kit, but the custom model doesn't actually render for weapons on the ground, so only the base weapon model shows up, which was made essentially invisible)

Burrowed headcrabs can't die

Gas goes through doors and props (needed to allow gas to affect players in vehicles, if it goes through level walls, the gas isn't checking for Line of Sight, which is a setting)

Players running faster then they should (in the GChem config located at garrysmod\data\gchem_config.txt, there is a variable table called NormalSpeed, which the mod currently sets unhindered players speed to, set the values to the intended normal running speed to fix)

Somewhat incompatible with Amnesia Lantern Rework (and other mods that use PlayerSpawn and PlayerDeath hooks)
Very incompatible with ragmod, as it getting up apparently counts as respawning

No new gases will be added to gchem as the code structuring is quite poor, making adding new gas a massive pain.

Appears GChem will cause peer to peer connections to lag as the main timer that applys chemical effects if poorly optimized and (I assume) GChem uses too much of network connections (connection issues presumed fixed)